message: Some `performance-noexcept-move-constructor`
  Summary: As title.
diff: @@ -1067,7 +1067,7 @@ struct SBHelper {
  }
  ScopedSplitHelper(const ScopedSplitHelper&) = delete;
  - ScopedSplitHelper(ScopedSplitHelper&& rhs)
  + ScopedSplitHelper(ScopedSplitHelper&& rhs) noexcept
  : block(rhs.block),
  first_sb(rhs.first_sb),
  overriding(rhs.overriding),
  @@ -1076,7 +1076,7 @@ struct SBHelper {
  }
  ScopedSplitHelper& operator=(const ScopedSplitHelper&) = delete;
  - ScopedSplitHelper& operator=(ScopedSplitHelper&& rhs) {
  + ScopedSplitHelper& operator=(ScopedSplitHelper&& rhs) noexcept {
  block = rhs.block;
  first_sb = rhs.first_sb;
  overriding = rhs.overriding;
  