new classes: implement default constructors.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 918 matching lines @@
   __ SmiToInteger64(rcx, rcx);
   __ jmp(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ movp(rcx, Operand(rdx, ArgumentsAdaptorFrameConstants::kLengthOffset));
 
   if (has_new_target()) {
     // Subtract 1 from smi-tagged arguments count.
     __ SmiToInteger32(rcx, rcx);
-    __ decp(rcx);
+    __ decl(rcx);

[arv (Not doing code reviews), 2015/02/11 16:41:45]

How is this related to this CL?

[Dmitry Lomov (no reviews), 2015/02/11 16:49:57]

Not really, just a sanity fix.

     __ Integer32ToSmi(rcx, rcx);
   }
   __ movp(args.GetArgumentOperand(2), rcx);
   __ SmiToInteger64(rcx, rcx);
   __ leap(rdx, Operand(rdx, rcx, times_pointer_size,
                       StandardFrameConstants::kCallerSPOffset));
   __ movp(args.GetArgumentOperand(1), rdx);
 
   // Try the new space allocation. Start out with computing the size of
   // the arguments object and the elements array.
@@ skipping 4119 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64