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[flang][OpenMP] Use maxnum/minnum for lowering of max/min reduction o…
…perators (#89258) This patch changes the lowering of max and min to be lowered to arith::MaxNumFop and arith::MinNumFOp instead of using arith::MaximumFOp and arith::MinimumFOp. The arith::MaximumFOp and arith::MinimumFOp map to the corresponding intrinsics llvm.maximum.* and llvm.minimum.* intrinsics which conform to the semantics specified in the draft of IEEE 754-2019, which is not supported by all hardware. Instead using arith::MaximumFOp and arith::MinimumFOp will allow code generation for more targets and match the code generated by clang OpenMP. fixes #87955
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