Fix GDBJIT compilation on Mac after r15467.

src/gdb-jit.cc

 // Copyright 2010 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 1901 matching lines @@
   }
 
   __jit_debug_descriptor.relevant_entry_ = entry;
   __jit_debug_descriptor.action_flag_ = JIT_UNREGISTER_FN;
   __jit_debug_register_code();
 }
 
 
 static JITCodeEntry* CreateELFObject(CodeDescription* desc, Isolate* isolate) {
 #ifdef __MACH_O
-  MachO mach_o(zone);
+  Zone zone(isolate);
+  MachO mach_o(&zone);
   Writer w(&mach_o);
 
-  mach_o.AddSection(new(zone) MachOTextSection(kCodeAlignment,
-                                               desc->CodeStart(),
-                                               desc->CodeSize()));
+  mach_o.AddSection(new(&zone) MachOTextSection(kCodeAlignment,
+                                                desc->CodeStart(),
+                                                desc->CodeSize()));
 
-  CreateDWARFSections(desc, zone, &mach_o);
+  CreateDWARFSections(desc, &zone, &mach_o);
 
   mach_o.Write(&w, desc->CodeStart(), desc->CodeSize());
 #else
   Zone zone(isolate);
   ELF elf(&zone);
   Writer w(&elf);
 
   int text_section_index = elf.AddSection(
       new(&zone) FullHeaderELFSection(
           ".text",
@@ skipping 230 matching lines @@
   ScopedLock lock(mutex.Pointer());
   ASSERT(!IsLineInfoTagged(line_info));
   HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true);
   ASSERT(e->value == NULL);
   e->value = TagLineInfo(line_info);
 }
 
 
 } }  // namespace v8::internal
 #endif