[llvm] [LV][VPlan] Extract the implementation of transform Recipe to EVLRecipe into a small function. NFC (PR #119510)

[via llvm-commits]

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@@ -1442,13 +1442,93 @@ void VPlanTransforms::addActiveLaneMask(
     HeaderMask->replaceAllUsesWith(LaneMask);
 }
 
+// Try to convert \p CurRecipe to a corresponding EVL-based recipe. Returns
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LiqinWeng wrote:

done~

https://github.com/llvm/llvm-project/pull/119510