[llvm] [VPlan] Add VPIRBasicBlock, use to model pre-preheader. (PR #93398)

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git-clang-format --diff 3864bfd2e0ce7e32fd623c550660885599383e6a 38c2da3b716cd0ccbfdb07f06fa98e7164a50e4a -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlan.h llvm/unittests/Transforms/Vectorize/VPlanTestBase.h
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index b53fd38574..df165967fa 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -473,11 +473,7 @@ public:
   /// that are actually instantiated. Values of this enumeration are kept in the
   /// SubclassID field of the VPBlockBase objects. They are used for concrete
   /// type identification.
-  using VPBlockTy = enum {
-    VPBasicBlockSC,
-    VPRegionBlockSC,
-    VPIRBasicBlockSC
-  };
+  using VPBlockTy = enum { VPBasicBlockSC, VPRegionBlockSC, VPIRBasicBlockSC };
 
   using VPBlocksTy = SmallVectorImpl<VPBlockBase *>;
 

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https://github.com/llvm/llvm-project/pull/93398