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[DAG] Fold freeze(bitcast(x)) -> bitcast(freeze(x))
This is a very specific fold to fix an upstream poor codegen issue. InstCombine has the much more flexible pushFreezeToPreventPoisonFromPropagating but I don't think we're quite there with DAG/TLI handling for canCreateUndefOrPoison/isGuaranteedNotToBeUndefOrPoison value tracking yet. Fixes #54911 Differential Revision: https://reviews.llvm.org/D124185
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