[llvm] [VPlan] Hook IR blocks into VPlan during skeleton creation (NFC) (PR #114292)

[via llvm-commits]

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@@ -3713,11 +3713,6 @@ class VPlan {
   /// preheader of the vector loop.
   VPBasicBlock *Entry;
 
-  /// VPBasicBlock corresponding to the original preheader. Used to place
-  /// VPExpandSCEV recipes for expressions used during skeleton creation and the
-  /// rest of VPlan execution.
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ayalz wrote:

Retain comment to document Entry instead?

https://github.com/llvm/llvm-project/pull/114292