CodeGen: Strengthen definition of F{MIN|MAX}NUM_IEEE nodes (#85195)
Previously these were declared as having the 2008 behavior, with underspecified signed zero handling. Currently, AMDGPU, PPC and LoongArch mark these as legal. The AMDGPU and PPC instructions respect the signed zero behavior. The LoongArch documentation doesn't state, but I'm assuming it also does.
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