Recognize and optimize a.runtimeType == b.runtimeType pattern.

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/become.h"
@@ skipping 54 matching lines @@
 DEFINE_FLAG(bool, remove_script_timestamps_for_test, false,
             "Remove script timestamps to allow for deterministic testing.");
 
 DECLARE_FLAG(bool, show_invisible_frames);
 DECLARE_FLAG(bool, trace_deoptimization);
 DECLARE_FLAG(bool, trace_deoptimization_verbose);
 DECLARE_FLAG(bool, trace_reload);
 DECLARE_FLAG(bool, write_protect_code);
 DECLARE_FLAG(bool, support_externalizable_strings);
 
-
 static const char* const kGetterPrefix = "get:";
 static const intptr_t kGetterPrefixLength = strlen(kGetterPrefix);
 static const char* const kSetterPrefix = "set:";
 static const intptr_t kSetterPrefixLength = strlen(kSetterPrefix);
 
+
 // A cache of VM heap allocated preinitialized empty ic data entry arrays.
 RawArray* ICData::cached_icdata_arrays_[kCachedICDataArrayCount];
 
 cpp_vtable Object::handle_vtable_ = 0;
 cpp_vtable Object::builtin_vtables_[kNumPredefinedCids] = { 0 };
 cpp_vtable Smi::handle_vtable_ = 0;
 
 // These are initialized to a value that will force a illegal memory access if
 // they are being used.
 #if defined(RAW_NULL)
@@ skipping 22939 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart