Allow the optimizing compiler to use an existing macro assembler....

src/codegen.cc

 // Copyright 2009 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 207 matching lines @@
                                      Handle<Script> script,
                                      bool is_eval,
                                      CompilationInfo* info) {
   if (!script->IsUndefined() && !script->source()->IsUndefined()) {
     int len = String::cast(script->source())->length();
     Counters::total_old_codegen_source_size.Increment(len);
   }
   MakeCodePrologue(fun);
   // Generate code.
   const int kInitialBufferSize = 4 * KB;
-  CodeGenerator cgen(kInitialBufferSize, script, is_eval);
+  MacroAssembler masm(NULL, kInitialBufferSize);
+  CodeGenerator cgen(&masm, script, is_eval);
   CodeGeneratorScope scope(&cgen);
   cgen.GenCode(fun, info);
   if (cgen.HasStackOverflow()) {
     ASSERT(!Top::has_pending_exception());
     return Handle<Code>::null();
   }
 
   InLoopFlag in_loop = (cgen.loop_nesting() != 0) ? IN_LOOP : NOT_IN_LOOP;
   Code::Flags flags = Code::ComputeFlags(Code::FUNCTION, in_loop);
   return MakeCodeEpilogue(fun, cgen.masm(), flags, script);
@@ skipping 255 matching lines @@
 }
 
 
 void DebugerStatementStub::Generate(MacroAssembler* masm) {
   Runtime::Function* f = Runtime::FunctionForId(Runtime::kDebugBreak);
   masm->TailCallRuntime(ExternalReference(f), 0, f->result_size);
 }
 
 
 } }  // namespace v8::internal