[PATCH] D108091: [AggressiveInstCombine] Add shift left instruction to `TruncInstCombine` DAG

[Anton Afanasyev via Phabricator via llvm-commits]

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In D108091#2945739 <https://reviews.llvm.org/D108091#2945739>, @lebedev.ri wrote:

> @spatel this appears correct, but is this the right place for this logic, or should it be in `getMinBitWidth()`?

I've moved code closer to `getMinBitWidth()`, to count known bits for shifts only if correct dag is built. Also added early exit.


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https://reviews.llvm.org/D108091