[llvm] [GISel][CombinerHelper] Push freeze through non-poison-producing operands (PR #90618)

[Dhruv Chawla via llvm-commits]

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@@ -220,6 +220,13 @@ def idempotent_prop : GICombineRule<
    (match (idempotent_prop_frags $dst, $src)),
    (apply (GIReplaceReg $dst, $src))>;
 
+// Convert freeze(Op(Op0, NonPoisonOps...)) to Op(freeze(Op0), NonPoisonOps...)
+// when Op0 is not guaranteed non-poison
+def push_freeze_to_prevent_poison_propagation : GICombineRule<
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dc03-work wrote:

I thought that name was too long, so I had made it push_freeze_to_prevent_poison_propagation. But okay, done.

https://github.com/llvm/llvm-project/pull/90618