Merge remote-tracking branch 'origin/master' into utf8_validation_apis_3

Commit migrated from https://github.com/dotnet/coreclr/commit/15a361aebfcdf85218364a5143dc973d19a50305

diff --cc src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
Simple merge

diff --cc src/libraries/System.Private.CoreLib/src/System/Globalization/CompareInfo.cs
Simple merge

diff --cc src/libraries/System.Private.CoreLib/src/System/Globalization/TextInfo.cs
Simple merge