Dart VM: Simplify code generation for equality operators.

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 1577 matching lines @@
   if (in_event_notification_) return;
 
   // Check whether we are in a Dart function that the user is
   // interested in.
   ActivationFrame* frame = TopDartFrame();
   ASSERT(frame != NULL);
   const Function& func = frame->function();
   if (!IsDebuggable(func)) {
     return;
   }
+  if (frame->TokenPos() == Scanner::kDummyTokenIndex) {
+    return;
+  }
 
   if (FLAG_verbose_debug) {
     OS::Print(">>> single step break at %s:%" Pd " (func %s token %" Pd ")\n",
               String::Handle(frame->SourceUrl()).ToCString(),
               frame->LineNumber(),
               String::Handle(frame->QualifiedFunctionName()).ToCString(),
               frame->TokenPos());
   }
 
   stack_trace_ = CollectStackTrace();
@@ skipping 266 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart