[InstCombine] Fold redundant FP clamp selects; relax min-max-pattern bailout in visitFCmp (#173452) visitFCmp() previously bailed out when a following select matched a clamp pattern. This blocks simplifications when the clamp is provably redundant. This PR allows simplification for clamp selects of flavor SPF_FMAXNUM/ SPF_FMINNUM when one arm is a constant and the other is a sitofp/uitofp of an integer value, and the constant equals the exact min/max of that integer domain: * SPF_FMAXNUM (pattern max(X,C)): redundant if C is the minimum integer mapped exactly to FP (e.g. X = sitofp i8, C = -128.0f). * SPF_FMINNUM (pattern min(X,C)): redundant if C is the maximum integer mapped exactly to FP (e.g. X = uitofp i8, C = 255.0f). This fixes a regression in #173454 --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Yingwei Zheng <dtcxzyw@qq.com>
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