Make experimental/gc compilable on Mac OS.

src/isolate.h

 // 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 729 matching lines @@
   static const int kUC16AlphabetSize = 256;  // See StringSearchBase.
   static const int kBMMaxShift = 250;        // See StringSearchBase.
 
   // Accessors.
 #define GLOBAL_ACCESSOR(type, name, initialvalue)                       \
   inline type name() const {                                            \
     ASSERT(OFFSET_OF(Isolate, name##_) == name##_debug_offset_);        \
     return name##_;                                                     \
   }                                                                     \
   inline void set_##name(type value) {                                  \
-    ASSERT_EQ(OFFSET_OF(Isolate, name##_), name##_debug_offset_);       \
+    ASSERT(OFFSET_OF(Isolate, name##_) == name##_debug_offset_);        \
     name##_ = value;                                                    \
   }
   ISOLATE_INIT_LIST(GLOBAL_ACCESSOR)
 #undef GLOBAL_ACCESSOR
 
 #define GLOBAL_ARRAY_ACCESSOR(type, name, length)                       \
   inline type* name() {                                                 \
     ASSERT(OFFSET_OF(Isolate, name##_) == name##_debug_offset_);        \
     return &(name##_)[0];                                               \
   }
@@ skipping 560 matching lines @@
 
 // Mark the global context with out of memory.
 inline void Context::mark_out_of_memory() {
   global_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_