Resubmission of native memory allocation info surfacing in Observatory. Fixed crashing tests and st…

runtime/vm/malloc_hooks_x64.cc

+// Copyright (c) 2017, 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/malloc_hooks.h"
+
+#include "vm/globals.h"
+
+#if defined(TARGET_ARCH_X64)
+
+namespace dart {
+
+#if defined(DEBUG)
+const intptr_t kSkipCount = 6;
+#elif !(defined(PRODUCT) || defined(DEBUG))
+const intptr_t kSkipCount = 5;
+#endif
+
+}  // namespace dart
+
+#endif  // defined(TARGET_ARCH_X64)