[PATCH] D107766: [AggressiveInstCombine] Add shift instructions to `TruncInstCombine` DAG

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

I think we want to do this in three steps.
`lshr` is easy and obvious, but for `ashr` we want to count *sign* bits.
Haven't really thought about `shl`


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https://reviews.llvm.org/D107766