[llvm] [X86] Fold some (truncate (srl (add X, C1), C2)) patterns to (add (truncate (srl X, C2)), C1') (PR #126448)

[Simon Pilgrim via llvm-commits]

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https://github.com/RKSimon approved this pull request.

LGTM

https://github.com/llvm/llvm-project/pull/126448