[llvm] [DAGCombiner] Fold smax(X, -1)/smin(X, 0) to bitwise shift forms (PR #206242)

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github-actions[bot] wrote:

test-suite diff from fef2533e887d3baa9724da52e474278f63be35fa...a5ef315b86fc9d06f12f7e0743ebb4ac179b1142: https://github.com/llvm/llvm-project/actions/runs/28442845708/artifacts/7982380288

https://github.com/llvm/llvm-project/pull/206242