[llvm] [VPlan] Verify and handle FOR legality during header phi creation (NFC). (PR #191298)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.h llvm/lib/Transforms/Vectorize/VPlanUtils.cpp llvm/lib/Transforms/Vectorize/VPlanUtils.h --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp b/llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
index 223f94bef..574f14169 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
@@ -775,7 +775,8 @@ sinkRecurrenceUsersAfterPrevious(VPFirstOrderRecurrencePHIRecipe *FOR,
 }
 
 /// Try to hoist \p Previous and its operands before all users of \p FOR.
-/// \returns true if hoisting succeeded or was not necessary, and false otherwise.
+/// \returns true if hoisting succeeded or was not necessary, and false
+/// otherwise.
 static bool hoistPreviousBeforeFORUsers(VPFirstOrderRecurrencePHIRecipe *FOR,
                                         VPRecipeBase *Previous,
                                         VPDominatorTree &VPDT) {

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https://github.com/llvm/llvm-project/pull/191298