[llvm] [VPlan] Handle FirstActiveLane when unrolling. (PR #145394)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
index 4d3c16a93..4bc9e4090 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
@@ -345,7 +345,8 @@ void UnrollState::unrollBlock(VPBlockBase *VPB) {
     if (ToSkip.contains(&R) || isa<VPIRInstruction>(&R))
       continue;
 
-    // Add all VPValues for all parts to AnyOf, FirstActiveLaneMask and Compute*Result which combine all parts to compute the final value.
+    // Add all VPValues for all parts to AnyOf, FirstActiveLaneMask and
+    // Compute*Result which combine all parts to compute the final value.
     VPValue *Op1;
     if (match(&R, m_VPInstruction<VPInstruction::AnyOf>(m_VPValue(Op1))) ||
         match(&R, m_VPInstruction<VPInstruction::FirstActiveLane>(

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https://github.com/llvm/llvm-project/pull/145394