Revert "Reland [SimplifyCFG] Delete the unnecessary range check for small mask operation (#70542)"

This caused https://github.com/llvm/llvm-project/issues/71329

> Fix the compile crash when the default result has no result  for
> https://github.com/llvm/llvm-project/pull/65835
>
> Fixes https://github.com/llvm/llvm-project/issues/65120
> Reviewed By: zmodem, nikic

This reverts commit 7c4180a3.