[llvm] [VPlan] Allow VPWidenPHI in non-native path and copy DebugLoc (PR #118662)

[Philip Reames via llvm-commits]

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@@ -2285,10 +2285,16 @@ class VPWidenPHIRecipe : public VPSingleDefRecipe {
   /// List of incoming blocks. Only used in the VPlan native path.
   SmallVector<VPBasicBlock *, 2> IncomingBlocks;
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preames wrote:

Maybe update the comments above re: usage in vplan native?  Given this is now used in both paths, do these need delete or clarified?  

https://github.com/llvm/llvm-project/pull/118662