[libc-commits] [libc] [libc][NFC] Make `EXP_MANT_MASK` an implementation detail (PR #75621)

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

@lntue please disregard this PR. I'll split it in two, it's too much of a mixed bag.

https://github.com/llvm/llvm-project/pull/75621