Eliminate LocalVarDescriptors in some corner cases

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 4211 matching lines @@
   const Library& lib = Library::Handle(isolate, library());
   const Object& obj = Object::Handle(isolate, lib.LookupLocalObject(name));
   if (!obj.IsNull() && obj.IsLibraryPrefix()) {
     return LibraryPrefix::Cast(obj).raw();
   }
   return LibraryPrefix::null();
 }
 
 
 const char* Class::ToCString() const {
-  const char* format = "%s Class: %s";
+  const char* format = "%s %sClass: %s";
   const Library& lib = Library::Handle(library());
   const char* library_name = lib.IsNull() ? "" : lib.ToCString();
+  const char* patch_prefix = is_patch() ? "Patch " : "";
   const char* class_name = String::Handle(Name()).ToCString();
-  intptr_t len = OS::SNPrint(NULL, 0, format, library_name, class_name) + 1;
+  intptr_t len =
+      OS::SNPrint(NULL, 0, format, library_name, patch_prefix, class_name) + 1;
   char* chars = Thread::Current()->zone()->Alloc<char>(len);
-  OS::SNPrint(chars, len, format, library_name, class_name);
+  OS::SNPrint(chars, len, format, library_name, patch_prefix, class_name);
   return chars;
 }
 
 
 void Class::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Isolate* isolate = Isolate::Current();
   JSONObject jsobj(stream);
   if ((raw() == Class::null()) || (id() == kFreeListElement)) {
     // TODO(turnidge): This is weird and needs to be changed.
     jsobj.AddProperty("type", "null");
@@ skipping 17259 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart