[llvm] [VPlan] Set the containing plan when creating blocks (NFC). (PR #223269)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlan.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index 765446187..a4b2596a0 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -120,7 +120,8 @@ private:
   /// List of successor blocks.
   SmallVector<VPBlockBase *, 1> Successors;
 
-  /// VPlan containing the block. Set when the block is created via VPlan helpers.
+  /// VPlan containing the block. Set when the block is created via VPlan
+  /// helpers.
   VPlan *Plan = nullptr;
 
   /// Subclass identifier (for isa/dyn_cast).

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https://github.com/llvm/llvm-project/pull/223269