[release/11.0-preview4] Source code updates from dotnet/dotnet#420

dotnet-maestro[bot] wants to merge 1 commit intorelease/11.0-preview4dotnet/symreader:release/11.0-preview4from

darc-release/11.0-preview4-46e3ead0-b43e-477b-a39f-7b1216ac5e7edotnet/symreader:darc-release/11.0-preview4-46e3ead0-b43e-477b-a39f-7b1216ac5e7eCopy head branch name to clipboard