[llvm] [VPlan] Add initial CFG simplification, removing BranchOnCond true. (PR #106748)

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git-clang-format --diff aa612f3ade66b5dd3e95d028c0345a94c38e1ff8 b658dd2286ac666444b27f3c690ea0b8c3025964 --extensions h,cpp -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index e0fa977919..a534b4e3b7 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -3529,16 +3529,18 @@ public:
 
   /// Returns the 'middle' block of the plan, that is the block that selects
   /// whether to execute the scalar tail loop or the exit block from the loop
-  /// latch. If the scalar tail loop or exit block are known to always execute, the middle block may branch directly to the block.
+  /// latch. If the scalar tail loop or exit block are known to always execute,
+  /// the middle block may branch directly to the block.
   VPBasicBlock *getMiddleBlock() {
     if (!getScalarPreheader()->getPredecessors().empty())
-      return cast<VPBasicBlock>(getScalarPreheader()->getPredecessors().front());
+      return cast<VPBasicBlock>(
+          getScalarPreheader()->getPredecessors().front());
     if (getExitBlocks().size() == 1)
       return cast<VPBasicBlock>(getExitBlocks()[0]->getPredecessors().front());
     return nullptr;
   }
   const VPBasicBlock *getMiddleBlock() const {
-    return const_cast<VPlan*>(this)->getMiddleBlock();
+    return const_cast<VPlan *>(this)->getMiddleBlock();
   }
 
   /// Return the VPBasicBlock for the preheader of the scalar loop.

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https://github.com/llvm/llvm-project/pull/106748