fix compilation of check_top_bit

[vtjnash]

fixes #31819

We could try to do something complicated to ensure this doesn't happen elsewhere, but this is a quick pragmatic fix.

[vchuravy]

Since this is in particular necessary for the GPU, how hard would it be to add a Param that ignores @nospecialize?

[JeffBezanson]

Is it no longer possible to compile efficient calls to functions with @nospecialize, or does this just happen sometimes?

[vtjnash]

The @nospecialize was a no-op here and is a red-herring, but this just happens sometimes (usually with cold code paths like here)