Fix warning C4723 potential divide by zero
Fix warning C4723 potential divide by zero

Appears in VS 15.8 for arm64 builds.

Fixes #19715

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