[llvm] [VPlan] Introduce cannotHoistOrSinkRecipe (PR #162674)

[Florian Hahn via llvm-commits]

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@@ -1789,7 +1807,7 @@ sinkRecurrenceUsersAfterPrevious(VPFirstOrderRecurrencePHIRecipe *FOR,
         VPDT.properlyDominates(Previous, SinkCandidate))
       return true;
 
-    if (SinkCandidate->mayHaveSideEffects())
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fhahn wrote:

the new checks seem stricter than previously in some sense, with the relaxation for assumes. If this change sbehavior, would be good to have a test, same afor the changes below

https://github.com/llvm/llvm-project/pull/162674