Tweak order of interface declarations on string (#17660)
Tweak order of interface declarations on string (#17660)

Fixes https://github.com/dotnet/corefx/issues/29158
wtgodbe/coreclr,poizan42/coreclr,krk/coreclr,mmitche/coreclr,mmitche/coreclr,wtgodbe/coreclr,cshung/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,mmitche/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,mmitche/coreclr,cshung/coreclr,krk/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,krk/coreclr,krk/coreclr,poizan42/coreclr