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Commit 3f087e38 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] combineX86ShufflesRecursively - at Depth==0, only resolve KnownZero... 

[X86][SSE] combineX86ShufflesRecursively - at Depth==0, only resolve KnownZero if it removes an input.

This stops infinite loops where KnownUndef elements are converted to Zeroable, resulting in KnownZero elements which are then simplified (via SimplifyDemandedElts etc.) back to KnownUndef elements........

Prep fix for PR43024 which will allow rL368307 to be re-applied.
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