[interpreter] Remove special "prototype" load in class literals.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 470 matching lines @@
   if (!function_closure_.is_set()) {
     int index = Linkage::kJSCallClosureParamIndex;
     const Operator* op = common()->Parameter(index, "%closure");
     Node* node = NewNode(op, graph()->start());
     function_closure_.set(node);
   }
   return function_closure_.get();
 }
 
 
-Node* BytecodeGraphBuilder::BuildLoadObjectField(Node* object, int offset) {
-  return NewNode(jsgraph()->machine()->Load(MachineType::AnyTagged()), object,
-                 jsgraph()->IntPtrConstant(offset - kHeapObjectTag));
-}
-
-
 Node* BytecodeGraphBuilder::BuildLoadImmutableObjectField(Node* object,
                                                           int offset) {
   return graph()->NewNode(jsgraph()->machine()->Load(MachineType::AnyTagged()),
                           object,
                           jsgraph()->IntPtrConstant(offset - kHeapObjectTag),
                           graph()->start(), graph()->start());
 }
 
 
 Node* BytecodeGraphBuilder::BuildLoadNativeContextField(int index) {
@@ skipping 449 matching lines @@
 void BytecodeGraphBuilder::VisitKeyedStoreICSloppyWide() {
   DCHECK(is_sloppy(language_mode()));
   BuildKeyedStore();
 }
 
 void BytecodeGraphBuilder::VisitKeyedStoreICStrictWide() {
   DCHECK(is_strict(language_mode()));
   BuildKeyedStore();
 }
 
-void BytecodeGraphBuilder::VisitLdaInitialMap() {
-  Node* js_function = environment()->LookupAccumulator();
-  Node* load = BuildLoadObjectField(js_function,
-                                    JSFunction::kPrototypeOrInitialMapOffset);
-  environment()->BindAccumulator(load);
-}
-
 void BytecodeGraphBuilder::VisitPushContext() {
   Node* new_context = environment()->LookupAccumulator();
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0),
                               environment()->Context());
   environment()->SetContext(new_context);
 }
 
 void BytecodeGraphBuilder::VisitPopContext() {
   Node* context =
       environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
@@ skipping 849 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8