Fix mac x64 build.

src/x64/fast-codegen-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1660 matching lines @@
 }
 
 
 Register FastCodeGenerator::result_register() { return rax; }
 
 
 Register FastCodeGenerator::context_register() { return rsi; }
 
 
 void FastCodeGenerator::StoreToFrameField(int frame_offset, Register value) {
-  ASSERT_EQ(POINTER_SIZE_ALIGN(frame_offset),
-            static_cast<intptr_t>(frame_offset));
+  ASSERT_EQ(POINTER_SIZE_ALIGN(frame_offset), static_cast<int>(frame_offset));
   __ movq(Operand(rbp, frame_offset), value);
 }
 
 
 void FastCodeGenerator::LoadContextField(Register dst, int context_index) {
   __ movq(dst, CodeGenerator::ContextOperand(rsi, context_index));
 }
 
 
 // ----------------------------------------------------------------------------
@@ skipping 27 matching lines @@
   __ movq(Operand(rsp, 0), rdx);
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal