[main] Source code updates from dotnet/dotnet - #460

[main] Source code updates from dotnet/dotnet#460

dotnet-maestro[bot] merged 5 commits into

maindotnet/symreader:mainfrom

darc-main-2cecb45e-2416-4f9b-909c-ceddf894e41cdotnet/symreader:darc-main-2cecb45e-2416-4f9b-909c-ceddf894e41cCopy head branch name to clipboard