Remove use of Isolate::Current in regexp macro assemblers.

src/x64/regexp-macro-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 102 matching lines @@
  *              bool direct_call)
  */
 
 #define __ ACCESS_MASM((&masm_))
 
 RegExpMacroAssemblerX64::RegExpMacroAssemblerX64(
     Mode mode,
     int registers_to_save,
     Zone* zone)
     : NativeRegExpMacroAssembler(zone),
-      masm_(Isolate::Current(), NULL, kRegExpCodeSize),
+      masm_(zone->isolate(), NULL, kRegExpCodeSize),
       no_root_array_scope_(&masm_),
       code_relative_fixup_positions_(4, zone),
       mode_(mode),
       num_registers_(registers_to_save),
       num_saved_registers_(registers_to_save),
       entry_label_(),
       start_label_(),
       success_label_(),
       backtrack_label_(),
       exit_label_() {
@@ skipping 1305 matching lines @@
   }
 }
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64