Disable ProfilerNativeStackWalker on Win64

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/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
 #include "vm/code_patcher.h"
 #include "vm/isolate.h"
@@ skipping 2068 matching lines @@
       // We are executing Dart code. We have frame pointers.
       ProfilerDartStackWalker stackWalker(isolate,
                                           sample,
                                           stack_lower,
                                           stack_upper,
                                           state.pc,
                                           state.fp,
                                           state.sp);
       stackWalker.walk();
     } else {
+#if defined(TARGET_OS_WINDOWS) && defined(TARGET_ARCH_X64)
+      // ProfilerNativeStackWalker is known to cause crashes on Win64.
+      // BUG=20423.
+      sample->set_ignore_sample(true);
+#else
       // Fall back to an extremely conservative stack walker.
       ProfilerNativeStackWalker stackWalker(sample,
                                             stack_lower,
                                             stack_upper,
                                             state.pc,
                                             state.fp,
                                             state.sp);
       stackWalker.walk();
+#endif
     }
   }
 }
 
 }  // namespace dart