[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: no
 test function name: test
 
 ---
 snippet: "
   var test;
   (function() {
     class A {
       method() { return 2; }
     }
     class B extends A {
       method() { return super.method() + 1; }
     }
     test = new B().method;
     test();
   })();
 "
 frame size: 7
 parameter count: 1
 bytecode array length: 56
 bytecodes: [
-                B(Ldar), R(closure),
-                B(Star), R(0),
+                B(Mov), R(closure), R(0),
   /*   99 E> */ B(StackCheck),
-  /*  104 S> */ B(Ldar), R(this),
-                B(Star), R(3),
-  /*  111 E> */ B(Ldar), R(0),
+  /*  104 S> */ B(Nop),
+  /*  111 E> */ B(Ldar), R(closure),
+                B(Mov), R(this), R(3),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(6),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(6), U8(1),
                 B(Star), R(6),
   /*  111 E> */ B(LdaConstant), U8(1),
-                B(LdrKeyedProperty), R(6), U8(3), R(4),
+                B(LdaKeyedProperty), R(6), U8(3),
+                B(Star), R(4),
                 B(LdaConstant), U8(2),
                 B(Star), R(5),
                 B(CallRuntime), U16(Runtime::kLoadFromSuper), R(3), U8(3),
                 B(Mov), R(3), R(2),
                 B(Star), R(1),
   /*  117 E> */ B(Call), R(1), R(2), U8(1), U8(1),
                 B(Star), R(3),
                 B(LdaSmi), U8(1),
                 B(Add), R(3),
   /*  131 S> */ B(Return),
@@ skipping 16 matching lines @@
     }
     class B extends A {
       method() { super.x = 2; return super.x; }
     }
     test = new B().method;
     test();
   })();
 "
 frame size: 6
 parameter count: 1
-bytecode array length: 78
+bytecode array length: 79
 bytecodes: [
-                B(Ldar), R(closure),
-                B(Star), R(0),
+                B(Mov), R(closure), R(0),
   /*  125 E> */ B(StackCheck),
-  /*  130 S> */ B(Ldar), R(this),
-                B(Star), R(1),
-  /*  130 E> */ B(Ldar), R(0),
+  /*  130 S> */ B(Nop),
+  /*  130 E> */ B(Ldar), R(closure),
+                B(Mov), R(this), R(1),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(5),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(5), U8(1),
                 B(Star), R(5),
   /*  130 E> */ B(LdaConstant), U8(1),
-                B(LdrKeyedProperty), R(5), U8(1), R(2),
+                B(LdaKeyedProperty), R(5), U8(1),
+                B(Star), R(2),
                 B(LdaConstant), U8(2),
                 B(Star), R(3),
                 B(LdaSmi), U8(2),
   /*  138 E> */ B(Star), R(4),
                 B(CallRuntime), U16(Runtime::kStoreToSuper_Strict), R(1), U8(4),
-  /*  143 S> */ B(Ldar), R(this),
-                B(Star), R(1),
+  /*  143 S> */ B(Nop),
   /*  150 E> */ B(Ldar), R(0),
+                B(Mov), R(this), R(1),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(4), U8(1),
                 B(Star), R(4),
   /*  150 E> */ B(LdaConstant), U8(1),
-                B(LdrKeyedProperty), R(4), U8(3), R(2),
+                B(LdaKeyedProperty), R(4), U8(3),
+                B(Star), R(2),
                 B(LdaConstant), U8(2),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kLoadFromSuper), R(1), U8(3),
   /*  159 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::SYMBOL_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var test;
   (function() {
     class A {
       constructor(x) { this.x_ = x; }
     }
     class B extends A {
       constructor() { super(1); this.y_ = 2; }
     }
     test = new B().constructor;
   })();
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 106
+bytecode array length: 105
 bytecodes: [
-                B(Ldar), R(closure),
-                B(Star), R(1),
-                B(Ldar), R(new_target),
-                B(Star), R(0),
+                B(Mov), R(closure), R(1),
+                B(Mov), R(new_target), R(0),
   /*  113 E> */ B(StackCheck),
-  /*  118 S> */ B(Ldar), R(1),
+  /*  118 S> */ B(Ldar), R(closure),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::k_GetSuperConstructor), R(2), U8(1),
                 B(Star), R(2),
                 B(LdaSmi), U8(1),
-                B(Star), R(3),
-  /*  118 E> */ B(Ldar), R(0),
+  /*  118 E> */ B(Star), R(3),
+                B(Ldar), R(0),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(1),
                 B(Star), R(4),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(4), U8(1),
   /*  118 E> */ B(New), R(2), R(3), U8(1),
   /*  118 E> */ B(Star), R(2),
                 B(Ldar), R(this),
                 B(JumpIfNotHole), U8(4),
                 B(Jump), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
-                B(Ldar), R(2),
-                B(Star), R(this),
-  /*  128 S> */ B(JumpIfNotHole), U8(11),
+                B(Mov), R(2), R(this),
+  /*  128 S> */ B(Ldar), R(this),
+                B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
                 B(Star), R(2),
                 B(LdaSmi), U8(2),
   /*  136 E> */ B(StaNamedPropertyStrict), R(2), U8(3), U8(4),
                 B(Ldar), R(this),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(2),
@@ skipping 17 matching lines @@
       constructor() { this.x_ = 1; }
     }
     class B extends A {
       constructor() { super(); this.y_ = 2; }
     }
     test = new B().constructor;
   })();
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 102
+bytecode array length: 101
 bytecodes: [
-                B(Ldar), R(closure),
-                B(Star), R(1),
-                B(Ldar), R(new_target),
-                B(Star), R(0),
+                B(Mov), R(closure), R(1),
+                B(Mov), R(new_target), R(0),
   /*  112 E> */ B(StackCheck),
-  /*  117 S> */ B(Ldar), R(1),
+  /*  117 S> */ B(Ldar), R(closure),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(0),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::k_GetSuperConstructor), R(2), U8(1),
-                B(Star), R(2),
-  /*  117 E> */ B(Ldar), R(0),
+  /*  117 E> */ B(Star), R(2),
+                B(Ldar), R(0),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(1),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
   /*  117 E> */ B(New), R(2), R(0), U8(0),
   /*  117 E> */ B(Star), R(2),
                 B(Ldar), R(this),
                 B(JumpIfNotHole), U8(4),
                 B(Jump), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(3),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(3), U8(1),
-                B(Ldar), R(2),
-                B(Star), R(this),
-  /*  126 S> */ B(JumpIfNotHole), U8(11),
+                B(Mov), R(2), R(this),
+  /*  126 S> */ B(Ldar), R(this),
+                B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
                 B(Star), R(2),
                 B(LdaSmi), U8(2),
   /*  134 E> */ B(StaNamedPropertyStrict), R(2), U8(3), U8(4),
                 B(Ldar), R(this),
                 B(JumpIfNotHole), U8(11),
                 B(LdaConstant), U8(2),
                 B(Star), R(2),
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
   /*  139 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]