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

src/arm/codegen-arm.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 103 matching lines @@
 
 CodeGenState::~CodeGenState() {
   ASSERT(owner_->state() == this);
   owner_->set_state(previous_);
 }
 
 
 // -------------------------------------------------------------------------
 // CodeGenerator implementation
 
-CodeGenerator::CodeGenerator(int buffer_size, Handle<Script> script,
+CodeGenerator::CodeGenerator(MacroAssembler* masm,
+                             Handle<Script> script,
                              bool is_eval)
     : is_eval_(is_eval),
       script_(script),
       deferred_(8),
-      masm_(new MacroAssembler(NULL, buffer_size)),
+      masm_(masm),
       scope_(NULL),
       frame_(NULL),
       allocator_(NULL),
       cc_reg_(al),
       state_(NULL),
       function_return_is_shadowed_(false) {
 }
 
 
 // Calling conventions:
@@ skipping 6802 matching lines @@
   // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
   // tagged as a small integer.
   __ bind(&runtime);
   __ TailCallRuntime(ExternalReference(Runtime::kStringCompare), 2, 1);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal