Make experimental/gc compilable on Mac OS.

src/isolate.cc

 // Copyright 2011 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 1682 matching lines @@
 #endif
 
   if (state_ == UNINITIALIZED && !PreInit()) return false;
 
   // Enable logging before setting up the heap
   logger_->Setup();
 
   CpuProfiler::Setup();
   HeapProfiler::Setup();
 
-  // If the serializer is enabled we will use only the platform to determine
-  // the CPU.  We can do that without generating probe code, so we don't need
-  // the heap to be set up first.  We move up the detection to here so that
-  // the builtins can make use of the information.
-  if (Serializer::enabled()) CPU::Setup();
-
   // Initialize other runtime facilities
 #if defined(USE_SIMULATOR)
 #if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
   Simulator::Initialize(this);
 #endif
 #endif
 
   { // NOLINT
     // Ensure that the thread has a valid stack guard.  The v8::Locker object
     // will ensure this too, but we don't have to use lockers if we are only
@@ skipping 135 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal