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Chuanqi Xu
f6de5306ec
StackLifetime class collects lifetime marker of an `alloca` by collect the user of `BitCast` who is the user of the `alloca`. However, either the `alloca` itself could be used with the lifetime marker or the `BitCast` of the `alloca` could be transformed to other instructions. (e.g., it may be transformed to all zero reps in `InstCombine` pass). This patch tries to fix this process in `collectMarkers` functions. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D85399