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Sometimes LegalizeTypes knows about common subexpressions before SelectionDAG does, leading to accidental SDValue removal before its reference count was truly zero. Differential Revision: https://reviews.llvm.org/D76994 Reviewed-By: bjope Fixes: https://bugs.llvm.org/show_bug.cgi?id=45049 Reverted in 3ce77142a6452d76d6f97c9a6c2da193e78841ba because the previous patch broke the expensive-checks bots. The new patch removes the broken check.
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