[X86] InstCombine: Generalize scalar SSE MAX/MIN intrinsics (#175375) Fixes #175162 This patch handles x86_sse_max_ss/min_ss and related intrinsics. It check if is known to be safe to convert them to llvm.maxnum/minnum. These intrinsics can be converted to `@llvm.maxnum` and `@llvm.minnum`. This optimization can be done if the inputs are free of: NaN, Inf, Subnormal, and NegZero. If it is not sure to be free of these, the instructions remain the same.
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