Remove the dependency of Zone on Isolate

src/gdb-jit.cc

 // Copyright 2010 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.
 
 #ifdef ENABLE_GDB_JIT_INTERFACE
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 1900 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
-  Zone zone(isolate);
+  Zone zone;
   MachO mach_o(&zone);
   Writer w(&mach_o);
 
   mach_o.AddSection(new(&zone) MachOTextSection(kCodeAlignment,
                                                 desc->CodeStart(),
                                                 desc->CodeSize()));
 
   CreateDWARFSections(desc, &zone, &mach_o);
 
   mach_o.Write(&w, desc->CodeStart(), desc->CodeSize());
 #else
-  Zone zone(isolate);
+  Zone zone;
   ELF elf(&zone);
   Writer w(&elf);
 
   int text_section_index = elf.AddSection(
       new(&zone) FullHeaderELFSection(
           ".text",
           ELFSection::TYPE_NOBITS,
           kCodeAlignment,
           desc->CodeStart(),
           0,
@@ skipping 176 matching lines @@
     UnregisterCodeEntry(entry);
     DestroyCodeEntry(entry);
   }
   e->value = NULL;
   GetEntries()->Remove(code, HashForCodeObject(code));
 }
 
 
 void GDBJITInterface::RemoveCodeRange(Address start, Address end) {
   HashMap* entries = GetEntries();
-  Zone zone(Isolate::Current());
+  Zone zone;
   ZoneList<Code*> dead_codes(1, &zone);
 
   for (HashMap::Entry* e = entries->Start(); e != NULL; e = entries->Next(e)) {
     Code* code = reinterpret_cast<Code*>(e->key);
     if (code->address() >= start && code->address() < end) {
       dead_codes.Add(code, &zone);
     }
   }
 
   for (int i = 0; i < dead_codes.length(); i++) {
@@ skipping 54 matching lines @@
           reinterpret_cast<Address>(event->code_start));
       RegisterDetailedLineInfo(code, line_info);
       break;
     }
   }
 }
 
 
 } }  // namespace v8::internal
 #endif