Fix performance degradation in Havlak: prevent conflicting method recognizer kinds to be stored in …

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 5463 matching lines @@
   set_kind_tag(ModifierBits::update(value, raw_ptr()->kind_tag_));
 }
 
 
 void Function::set_is_intrinsic(bool value) const {
   set_kind_tag(IntrinsicBit::update(value, raw_ptr()->kind_tag_));
 }
 
 
 void Function::set_recognized_kind(MethodRecognizer::Kind value) const {
+  // Prevent multiple settings of kind.
+  ASSERT((value == MethodRecognizer::kUnknown) || !IsRecognized());
   set_kind_tag(RecognizedBits::update(value, raw_ptr()->kind_tag_));
 }
 
 
 void Function::set_is_redirecting(bool value) const {
   set_kind_tag(RedirectingBit::update(value, raw_ptr()->kind_tag_));
 }
 
 
 void Function::set_is_static(bool value) const {
@@ skipping 14089 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart