The speedup doesn't appear to have been from this, but was an anomaly of my testing machine.

llvm-svn: 153951

llvm/lib/VMCore/Metadata.cpp

@@ -553,7 +553,6 @@ getAllMetadataOtherThanDebugLocImpl(SmallVectorImpl<std::pair<unsigned,
   const LLVMContextImpl::MDMapTy &Info =
     getContext().pImpl->MetadataStore.find(this)->second;
   assert(!Info.empty() && "Shouldn't have called this");
-  Result.reserve(Info.size());
   Result.append(Info.begin(), Info.end());
 
   // Sort the resulting array so it is stable.