Method lookup

src/lib/Bitcode/Reader/MetadataLoader.cpp:151–155

  }

  Metadata *lookup(unsigned I) const {
    if (I < MetadataPtrs.size())
      return MetadataPtrs[I];
    return nullptr;
  }

  void shrinkTo(unsigned N) {
    assert(N <= size() && "Invalid shrinkTo request!");