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

src/full-codegen/mips/full-codegen-mips.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_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 2211 matching lines @@
     default:
       UNREACHABLE();
   }
 
   __ bind(&done);
   context()->Plug(v0);
 }
 
 
 void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
-  // Constructor is in v0.
-  DCHECK(lit != NULL);
-  __ push(v0);
-
-  // No access check is needed here since the constructor is created by the
-  // class literal.
-  Register scratch = a1;
-  __ lw(scratch,
-        FieldMemOperand(v0, JSFunction::kPrototypeOrInitialMapOffset));
-  __ push(scratch);
-
   for (int i = 0; i < lit->properties()->length(); i++) {
     ObjectLiteral::Property* property = lit->properties()->at(i);
     Expression* value = property->value();
 
+    Register scratch = a1;
     if (property->is_static()) {
       __ lw(scratch, MemOperand(sp, kPointerSize));  // constructor
     } else {
       __ lw(scratch, MemOperand(sp, 0));  // prototype
     }
     __ push(scratch);
     EmitPropertyKey(property, lit->GetIdForProperty(i));
 
     // The static prototype property is read only. We handle the non computed
     // property name case in the parser. Since this is the only case where we
@@ skipping 27 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) {
   __ mov(a0, result_register());
   __ pop(a1);
   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());
@@ skipping 2381 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS