[llvm] [VPlan] Materialize constant vector trip counts before final opts. (PR #142309)

[Florian Hahn via llvm-commits]

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@@ -90,29 +90,53 @@ for.end:
 }
 
 define i32 @constpre()  {
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fhahn wrote:

Those were caused by not materializing when interleaving; update the patch and additional tests when only interleaving

https://github.com/llvm/llvm-project/pull/142309