[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/GlobalDelete.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: no
 test function name: f
 
 ---
 snippet: "
   var a = {x:13, y:14};
   function f() {
     return delete a.x;
   };
   f();
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 10
+bytecode array length: 11
 bytecodes: [
   /*   32 E> */ B(StackCheck),
-  /*   39 S> */ B(LdrGlobal), U8(0), U8(1), R(0),
+  /*   39 S> */ B(LdaGlobal), U8(0), U8(1),
+                B(Star), R(0),
                 B(LdaConstant), U8(1),
                 B(DeletePropertySloppy), R(0),
   /*   58 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   a = {1:13, 2:14};
   function f() {
     'use strict';
     return delete a[1];
   };
   f();
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 10
+bytecode array length: 11
 bytecodes: [
   /*   28 E> */ B(StackCheck),
-  /*   51 S> */ B(LdrGlobal), U8(0), U8(1), R(0),
+  /*   51 S> */ B(LdaGlobal), U8(0), U8(1),
+                B(Star), R(0),
                 B(LdaSmi), U8(1),
                 B(DeletePropertyStrict), R(0),
   /*   71 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = {x:13, y:14};
   function f() {
     return delete a;
   };
   f();
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 14
+bytecode array length: 16
 bytecodes: [
   /*   32 E> */ B(StackCheck),
-  /*   39 S> */ B(LdrContextSlot), R(context), U8(3), R(0),
-                B(LdrContextSlot), R(0), U8(2), R(1),
+  /*   39 S> */ B(LdaContextSlot), R(context), U8(3),
+                B(Star), R(0),
+                B(LdaContextSlot), R(0), U8(2),
+                B(Star), R(1),
                 B(LdaConstant), U8(0),
                 B(DeletePropertySloppy), R(1),
   /*   56 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   b = 30;
   function f() {
     return delete b;
   };
   f();
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 14
+bytecode array length: 16
 bytecodes: [
   /*   18 E> */ B(StackCheck),
-  /*   25 S> */ B(LdrContextSlot), R(context), U8(3), R(0),
-                B(LdrContextSlot), R(0), U8(2), R(1),
+  /*   25 S> */ B(LdaContextSlot), R(context), U8(3),
+                B(Star), R(0),
+                B(LdaContextSlot), R(0), U8(2),
+                B(Star), R(1),
                 B(LdaConstant), U8(0),
                 B(DeletePropertySloppy), R(1),
   /*   42 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]