[main] Source code updates from dotnet/dotnet#1451

ellahathaway merged 2 commits intomaindotnet/source-build-reference-packages:mainfrom

darc-main-61e0b66d-8de6-4cff-8cc8-7886ec137bf0dotnet/source-build-reference-packages:darc-main-61e0b66d-8de6-4cff-8cc8-7886ec137bf0Copy head branch name to clipboard