message: default-initialize SourceBlockStats members
  Summary: as in the title, default-initialize members of SourceBlockStats to 0
diff: @@ -747,16 +747,16 @@ class AfterPassSizes {
  };
  struct SourceBlocksStats {
  - size_t total_blocks;
  - size_t source_blocks_present;
  - size_t source_blocks_total;
  - size_t methods_with_sbs;
  - size_t flow_violation_idom;
  - size_t flow_violation_direct_predecessors;
  - size_t flow_violation_cold_direct_predecessors;
  - size_t methods_with_cold_direct_predecessor_violations;
  - size_t methods_with_idom_violations;
  - size_t methods_with_direct_predecessor_violations;
  + size_t total_blocks{0};
  + size_t source_blocks_present{0};
  + size_t source_blocks_total{0};
  + size_t methods_with_sbs{0};
  + size_t flow_violation_idom{0};
  + size_t flow_violation_direct_predecessors{0};
  + size_t flow_violation_cold_direct_predecessors{0};
  + size_t methods_with_cold_direct_predecessor_violations{0};
  + size_t methods_with_idom_violations{0};
  + size_t methods_with_direct_predecessor_violations{0};
  SourceBlocksStats& operator+=(const SourceBlocksStats& that) {
  total_blocks += that.total_blocks;
  @@ -793,12 +793,11 @@ void track_source_block_coverage(PassManager& mgr,
  Timer opt_timer("Calculate SourceBlock Coverage");
  auto stats = walk::parallel::methods<SourceBlocksStats>(
  build_class_scope(stores), [](DexMethod* m) -> SourceBlocksStats {
  - SourceBlocksStats ret{0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  + SourceBlocksStats ret;
  auto code = m->get_code();
  if (!code) {
  return ret;
  }
  -
  code->build_cfg(/* editable */ true);
  auto& cfg = code->cfg();
  auto dominators =
  