[release/10.0] Source code updates from dotnet/dotnet#434

phil-allen-msft merged 2 commits into

release/10.0dotnet/symreader:release/10.0from

darc-release/10.0-018b315d-5b5e-4747-a9de-ad8e3382cebbdotnet/symreader:darc-release/10.0-018b315d-5b5e-4747-a9de-ad8e3382cebbCopy head branch name to clipboard