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

src/interpreter/bytecode-generator.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/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/control-flow-builders.h"
@@ skipping 1223 matching lines @@
     VisitDeclarations(expr->scope()->declarations());
     VisitClassLiteralContents(expr);
   } else {
     VisitDeclarations(expr->scope()->declarations());
     VisitClassLiteralContents(expr);
   }
 }
 
 void BytecodeGenerator::VisitClassLiteralContents(ClassLiteral* expr) {
   VisitClassLiteralForRuntimeDefinition(expr);
-  // The prototype is ensured to exist by Runtime_DefineClass in
-  // VisitClassForRuntimeDefinition. No access check is needed here
-  // since the constructor is created by the class literal.
+
+  // Load the "prototype" from the constructor.
   register_allocator()->PrepareForConsecutiveAllocations(2);
   Register literal = register_allocator()->NextConsecutiveRegister();
   Register prototype = register_allocator()->NextConsecutiveRegister();
+  Handle<String> name = isolate()->factory()->prototype_string();
+  FeedbackVectorSlot slot = expr->PrototypeSlot();
   builder()
       ->StoreAccumulatorInRegister(literal)
-      .LoadPrototypeOrInitialMap()
+      .LoadNamedProperty(literal, name, feedback_index(slot), language_mode())
       .StoreAccumulatorInRegister(prototype);
 
   VisitClassLiteralProperties(expr, literal, prototype);
   builder()->CallRuntime(Runtime::kFinalizeClassDefinition, literal, 2);
   // Assign to class variable.
   if (expr->class_variable_proxy() != nullptr) {
     Variable* var = expr->class_variable_proxy()->var();
     FeedbackVectorSlot slot = expr->NeedsProxySlot()
                                   ? expr->ProxySlot()
                                   : FeedbackVectorSlot::Invalid();
@@ skipping 1446 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8