[ValueTracking][InstCombine] Generalize ignoreSignBitOfZero/NaN to handle more cases (#141015) This patch was originally part of https://github.com/llvm/llvm-project/pull/139861. It generalizes `ignoreSignBitOfZero/NaN` to handle more instructions/intrinsics. BTW, I find it mitigates performance regressions caused by https://github.com/llvm/llvm-project/pull/141010 (IR diff https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2365/files). We don't need to propagate FMF from fcmp into select, since we can infer demanded properties from the user of select.
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