MIPS: Fix [stubs] Introduce a dedicated FastNewObjectStub

src/mips/code-stubs-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
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4731 matching lines @@
 
   // Verify that the new target is a JSFunction.
   Label new_object;
   __ GetObjectType(a3, a2, a2);
   __ Branch(&new_object, ne, a2, Operand(JS_FUNCTION_TYPE));
 
   // Load the initial map and verify that it's in fact a map.
   __ lw(a2, FieldMemOperand(a3, JSFunction::kPrototypeOrInitialMapOffset));
   __ JumpIfSmi(a2, &new_object);
   __ GetObjectType(a2, a0, a0);
-  __ Branch(&new_object, ne, a2, Operand(MAP_TYPE));
+  __ Branch(&new_object, ne, a0, Operand(MAP_TYPE));
 
   // Fall back to runtime if the target differs from the new target's
   // initial map constructor.
   __ lw(a0, FieldMemOperand(a2, Map::kConstructorOrBackPointerOffset));
   __ Branch(&new_object, ne, a0, Operand(a1));
 
   // Allocate the JSObject on the heap.
   Label allocate, done_allocate;
   __ lbu(t0, FieldMemOperand(a2, Map::kInstanceSizeOffset));
   __ Allocate(t0, v0, t1, a0, &allocate, SIZE_IN_WORDS);
@@ skipping 1006 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS