Fix a warning as error issue that causes a build break on the Desktop CLR
Fix a warning as error issue that causes a build break on the Desktop CLR

[tfs-changeset: 1702868]

mmitche/coreclr,cshung/coreclr,cshung/coreclr,wtgodbe/coreclr,krk/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,mmitche/coreclr,wtgodbe/coreclr,poizan42/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,wtgodbe/coreclr,krk/coreclr,poizan42/coreclr,cshung/coreclr,mmitche/coreclr,krk/coreclr,poizan42/coreclr,mmitche/coreclr,mmitche/coreclr,mmitche/coreclr,krk/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr