[interpreter] Make sure allocated registers are always materialized in the register optimizer.

test/cctest/interpreter/bytecode_expectations/ObjectLiterals.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   return { };
@@ skipping 317 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 'test'; return { [a]: 1, __proto__: {} };
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 40
+bytecode array length: 38
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(4), U8(19), R(1),
   /*   60 E> */ B(ToName), R(2),
                 B(LdaSmi), I8(1),
                 B(StaDataPropertyInLiteral), R(1), R(2), U8(0), U8(5),
                 B(CreateObjectLiteral), U8(1), U8(3), U8(19), R(4),
-                B(Star), R(3),
                 B(Mov), R(1), R(2),
                 B(Mov), R(4), R(3),
                 B(CallRuntime), U16(Runtime::kInternalSetPrototype), R(2), U8(2),
                 B(Ldar), R(2),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["test"],
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var n = 'name'; return { [n]: 'val', get a() { }, set a(b) {} };
 "
 frame size: 6
 parameter count: 1
-bytecode array length: 63
+bytecode array length: 61
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(5), U8(19), R(1),
   /*   60 E> */ B(ToName), R(2),
                 B(LdaConstant), U8(2),
                 B(StaDataPropertyInLiteral), R(1), R(2), U8(0), U8(6),
-                B(Star), R(3),
                 B(LdaConstant), U8(3),
                 B(Star), R(3),
                 B(CreateClosure), U8(4), U8(3), U8(2),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineGetterPropertyUnchecked), R(2), U8(4),
                 B(LdaConstant), U8(3),
                 B(Star), R(3),
                 B(CreateClosure), U8(5), U8(4), U8(2),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(CallRuntime), U16(Runtime::kDefineSetterPropertyUnchecked), R(2), U8(4),
                 B(Ldar), R(2),
   /*   99 S> */ B(Return),
 ]
 constant pool: [
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["name"],
   FIXED_ARRAY_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["val"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["a"],
   SHARED_FUNCTION_INFO_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]