Fix asserts in StackFrameIterator which were effectively disabled

runtime/lib/stacktrace.cc

 // Copyright (c) 2013, 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 "lib/stacktrace.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/debugger.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object_store.h"
@@ skipping 123 matching lines @@
   GET_NON_NULL_NATIVE_ARGUMENT(StackTrace, stack_trace,
                                arguments->NativeArgAt(0));
   thread->set_async_stack_trace(stack_trace);
   return Object::null();
 }
 
 
 static void AppendFrames(const GrowableObjectArray& code_list,
                          const GrowableObjectArray& pc_offset_list,
                          int skip_frames) {
-  StackFrameIterator frames(StackFrameIterator::kDontValidateFrames);
+  StackFrameIterator frames(StackFrameIterator::kDontValidateFrames,
+                            Thread::Current(),
+                            StackFrameIterator::kNoCrossThreadIteration);
   StackFrame* frame = frames.NextFrame();
   ASSERT(frame != NULL);  // We expect to find a dart invocation frame.
   Code& code = Code::Handle();
   Smi& offset = Smi::Handle();
   while (frame != NULL) {
     if (frame->IsDartFrame()) {
       if (skip_frames > 0) {
         skip_frames--;
       } else {
         code = frame->LookupDartCode();
@@ skipping 31 matching lines @@
 // set in dart code and control is got inside 'gdb' without going through
 // the runtime or native transition stub.
 void _printCurrentStackTrace() {
   const StackTrace& stacktrace = GetCurrentStackTrace(0);
   OS::PrintErr("=== Current Trace:\n%s===\n", stacktrace.ToCString());
 }
 
 
 // Like _printCurrentStackTrace, but works in a NoSafepointScope.
 void _printCurrentStackTraceNoSafepoint() {
-  StackFrameIterator frames(StackFrameIterator::kDontValidateFrames);
+  StackFrameIterator frames(StackFrameIterator::kDontValidateFrames,
+                            Thread::Current(),
+                            StackFrameIterator::kNoCrossThreadIteration);
   StackFrame* frame = frames.NextFrame();
   while (frame != NULL) {
     OS::PrintErr("%s\n", frame->ToCString());
     frame = frames.NextFrame();
   }
 }
 
 }  // namespace dart