AssemblerBase does not need remember a Zone. Fix this.

src/x64/assembler-x64.cc

 // Copyright 2012 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 327 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // Implementation of Assembler.
 
 #ifdef GENERATED_CODE_COVERAGE
 static void InitCoverageLog();
 #endif
 
 Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
-    : AssemblerBase(arg_isolate, arg_isolate->zone()),
+    : AssemblerBase(arg_isolate),
       code_targets_(100),
       positions_recorder_(this),
       emit_debug_code_(FLAG_debug_code) {
   if (buffer == NULL) {
     // Do our own buffer management.
     if (buffer_size <= kMinimalBufferSize) {
       buffer_size = kMinimalBufferSize;
 
       if (isolate() != NULL && isolate()->assembler_spare_buffer() != NULL) {
         buffer = isolate()->assembler_spare_buffer();
@@ skipping 2682 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64