Fix background compilation disassembly: allocate string in old space instead of new space.

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 13780 matching lines @@
 
 
 RawString* Code::Name() const {
   const Object& obj = Object::Handle(owner());
   if (obj.IsNull()) {
     // Regular stub.
     Thread* thread = Thread::Current();
     Zone* zone = thread->zone();
     const char* name = StubCode::NameOfStub(EntryPoint());
     ASSERT(name != NULL);
-    const String& stub_name = String::Handle(zone, String::New(name));
-    return Symbols::FromConcat(thread, Symbols::StubPrefix(), stub_name);
+    char* stub_name = OS::SCreate(zone,
+        "%s%s", Symbols::StubPrefix().ToCString(), name);
+    return Symbols::New(thread, stub_name, strlen(stub_name));
   } else if (obj.IsClass()) {
     // Allocation stub.
     Thread* thread = Thread::Current();
     Zone* zone = thread->zone();
     const Class& cls = Class::Cast(obj);
     String& cls_name = String::Handle(zone, cls.ScrubbedName());
     ASSERT(!cls_name.IsNull());
     return Symbols::FromConcat(thread, Symbols::AllocationStubFor(), cls_name);
   } else {
     ASSERT(obj.IsFunction());
@@ skipping 8316 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart