VM: Add infrastructure to support deferred generation of unoptimized code.

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 5089 matching lines @@
   StorePointer(&raw_ptr()->instructions_,
       Code::Handle(stub_code->LazyCompile_entry()->code()).instructions());
 }
 
 
 void Function::SwitchToUnoptimizedCode() const {
   ASSERT(HasOptimizedCode());
   Isolate* isolate = Isolate::Current();
   const Code& current_code = Code::Handle(isolate, CurrentCode());
 
-  if (FLAG_trace_disabling_optimized_code) {
+  if (FLAG_trace_deoptimization) {
     OS::Print("Disabling optimized code: '%s' entry: %#" Px "\n",
       ToFullyQualifiedCString(),
       current_code.EntryPoint());
   }
   // Patch entry of the optimized code.
   CodePatcher::PatchEntry(current_code);
   // Use previously compiled unoptimized code.
   AttachCode(Code::Handle(isolate, unoptimized_code()));
   CodePatcher::RestoreEntry(Code::Handle(isolate, unoptimized_code()));
   isolate->TrackDeoptimizedCode(current_code);
@@ skipping 15609 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart