[llvm] [DAGCombiner] Freeze maybe poison operands when folding select to logic (PR #84924)

[Björn Pettersson via llvm-commits]

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@@ -295,22 +295,28 @@ define float @select_icmp_sle(i32 %x, i32 %y, float %a, float %b) {
 ; Test peephole optimizations for select.
 define zeroext i1 @select_opt1(i1 zeroext %c, i1 zeroext %a) {
 ; CHECK-LABEL: select_opt1
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bjope wrote:

Another thing here is that the fast-isel code still optimizes this case. So either there is a bug in fast-isel that it doesn't consider poison here. Or we should be allowed to optimize this also for the regular SelectionDAG ISel.
Worth mentioning is that GlobalISel isn't part of the checks here, but it seems like GlobalISel also would emit the explicit AND.

https://github.com/llvm/llvm-project/pull/84924