message: fix OSS build in MethodDevirtualizer
  Summary: gcc 4.9 wasn't happy with the brace initialization
diff: @@ -69,7 +69,7 @@ class MethodDevirtualizer {
  DevirtualizerConfigs m_config;
  DevirtualizerMetrics m_metrics;
  - void reset_metrics() { m_metrics = {0, 0, 0, 0, 0}; }
  + void reset_metrics() { m_metrics = DevirtualizerMetrics(); }
  void staticize_methods_using_this(
  const std::vector<DexClass*>& scope,
  