[libc-commits] [libc] [libc] Fix a bug in fx_bits.h due to integer promotion of bitwise ops. (PR #83647)

[Joseph Huber via libc-commits]

https://github.com/jhuber6 approved this pull request.

Surprising that the `cpp:bit_cast` didn't do its own static cast.

https://github.com/llvm/llvm-project/pull/83647