[llvm] [InstCombine] Generalize ignoreSignBitOfZero/NaN to handle more cases (PR #141015)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Compile-time impact: https://llvm-compile-time-tracker.com/compare.php?from=5a3776af521b8ddc14a19d1954af64e2960d2397&to=bf96e741b99107ce14ef6e32751f73d98f8eb821&stat=instructions%3Au

Note that stage2-O3 compile-time overhead is high (+0.07%). It is mainly caused by moving these two helpers into ValueTracking.


https://github.com/llvm/llvm-project/pull/141015