[compiler] Remove the special case "prototype" load in class literals.

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2115 matching lines @@
       UNREACHABLE();
       break;
   }
 
   __ bind(&done);
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
-  // Constructor is in rax.
-  DCHECK(lit != NULL);
-  __ Push(rax);
-
-  // No access check is needed here since the constructor is created by the
-  // class literal.
-  Register scratch = rbx;
-  __ movp(scratch, FieldOperand(rax, JSFunction::kPrototypeOrInitialMapOffset));
-  __ Push(scratch);
-
   for (int i = 0; i < lit->properties()->length(); i++) {
     ObjectLiteral::Property* property = lit->properties()->at(i);
     Expression* value = property->value();
 
     if (property->is_static()) {
       __ Push(Operand(rsp, kPointerSize));  // constructor
     } else {
       __ Push(Operand(rsp, 0));  // prototype
     }
     EmitPropertyKey(property, lit->GetIdForProperty(i));
@@ skipping 30 matching lines @@
 
       case ObjectLiteral::Property::SETTER:
         __ Push(Smi::FromInt(DONT_ENUM));
         __ CallRuntime(Runtime::kDefineSetterPropertyUnchecked);
         break;
 
       default:
         UNREACHABLE();
     }
   }
-
-  // Set both the prototype and constructor to have fast properties, and also
-  // freeze them in strong mode.
-  __ CallRuntime(Runtime::kFinalizeClassDefinition);
 }
 
 
 void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr, Token::Value op) {
   __ Pop(rdx);
   Handle<Code> code =
       CodeFactory::BinaryOpIC(isolate(), op, strength(language_mode())).code();
   JumpPatchSite patch_site(masm_);    // unbound, signals no inlined smi code.
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
@@ skipping 2403 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64