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[InstCombine] Sink instructions with multiple users in a successor bl…
…ock. This patch tries to sink instructions when they are only used in a successor block. This is a further enhancement patch based on Anna's commit: D109700, which allows sinking an instruction having multiple uses in a single user. In this patch, sink instructions with multiple users in a single successor block will be supported. It could fix a known issue from rust: rust-lang/rust#51346 (comment) Reviewed By: nikic, reames Differential Revision: https://reviews.llvm.org/D121585
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