[LV] Do not try to sink dead instructions.
Dead instructions do not need to be sunk. Currently we try and record the recipies for them, but there are no recipes emitted for them and there's nothing to sink. They can be removed from SinkAfter while marking them for recording. Fixes PR44634. Reviewers: rengolin, hsaito, fhahn, Ayal, gilr Reviewed By: gilr Differential Revision: https://reviews.llvm.org/D73423 (cherry picked from commit a911fef3)
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