Move sticky_error_ from isolate to thread

runtime/vm/regexp_parser.cc

 // Copyright (c) 2014, 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/longjump.h"
 #include "vm/object_store.h"
 #include "vm/regexp_parser.h"
 
 namespace dart {
 
@@ skipping 1046 matching lines @@
     RegExpTree* tree = parser.ParsePattern();
     ASSERT(tree != NULL);
     ASSERT(result->error.IsNull());
     result->tree = tree;
     intptr_t capture_count = parser.captures_started();
     result->simple = tree->IsAtom() && parser.simple() && capture_count == 0;
     result->contains_anchor = parser.contains_anchor();
     result->capture_count = capture_count;
   } else {
     ASSERT(!result->error.IsNull());
-    Isolate::Current()->object_store()->clear_sticky_error();
+    Thread::Current()->clear_sticky_error();
 
     // Throw a FormatException on parsing failures.
     const String& message = String::Handle(
           String::Concat(result->error, input));
     const Array& args = Array::Handle(Array::New(1));
     args.SetAt(0, message);
 
     Exceptions::ThrowByType(Exceptions::kFormat, args);
   }
   return !parser.failed();
 }
 
 }  // namespace dart