[AMDGPU] Try to reuse register with the constant from compare in v_cndmask (#148740) For some targets, the optimization X == Const ? X : Y -> X == Const ? Const : Y can cause extra register usage or redundant immediate encoding for the constant in cndmask generated from the ternary operation. This patch detects such cases and reuses the register from the compare instruction that already holds the constant, instead of materializing it again for cndmask. The optimization avoids immediates that can be encoded into cndmask instruction (including +-0.0), as well as !isNormal() constants. The change is reworked on the base of #131146 --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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