Don't take a stack trace if we are in the middle of a deoptimization

runtime/vm/profiler.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 "platform/address_sanitizer.h"
 #include "platform/memory_sanitizer.h"
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
@@ skipping 971 matching lines @@
   }
 
   if (!InitialRegisterCheck(pc, fp, sp)) {
     return;
   }
 
   if (!CheckIsolate(isolate)) {
     return;
   }
 
+  if (thread->IsMutatorThread() && isolate->IsDeoptimizing()) {
+    return;
+  }
+
   uword stack_lower = 0;
   uword stack_upper = 0;
   if (!GetAndValidateIsolateStackBounds(thread,
                                         fp,
                                         sp,
                                         &stack_lower,
                                         &stack_upper)) {
     // Could not get stack boundary.
     return;
   }
@@ skipping 378 matching lines @@
 
 
 ProcessedSampleBuffer::ProcessedSampleBuffer()
     : code_lookup_table_(new CodeLookupTable(Thread::Current())) {
   ASSERT(code_lookup_table_ != NULL);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart