[SelectionDAG] Optimize BSWAP yet again once more#165292

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AZero13 wants to merge 4 commits intollvm:mainfrom

Commits on Oct 27, 2025

[ARM] Only change mask if demanded bits says we can optimize
AZero13
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Commits on Oct 28, 2025

[SelectionDAG] Optimize BSWAP yet again once more
AZero13
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Commits on Nov 1, 2025

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Optimize once more
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