Disable ProfilerNativeStackWalker on Win64

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index 83e2235f51636015c73abf847d78940388e50d31..565aa9183c999ef5b945222c9e0e61319f732bb5 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -2086,6 +2086,11 @@ void Profiler::RecordSampleInterruptCallback(
                                           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,
@@ -2094,6 +2099,7 @@ void Profiler::RecordSampleInterruptCallback(
                                             state.fp,
                                             state.sp);
       stackWalker.walk();
+#endif
     }
   }
 }