[NFC][LoopVectorize] Remove unused argument from fixupIVUsers (llvm#109789)

The VectorHeader argument passed to fixupIVUsers is unused
and can be removed.

Author: david-arm

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -541,8 +541,8 @@ class InnerLoopVectorizer {
   /// Set up the values of the IVs correctly when exiting the vector loop.
   void fixupIVUsers(PHINode *OrigPhi, const InductionDescriptor &II,
                     Value *VectorTripCount, Value *EndValue,
-                    BasicBlock *MiddleBlock, BasicBlock *VectorHeader,
-                    VPlan &Plan, VPTransformState &State);
+                    BasicBlock *MiddleBlock, VPlan &Plan,
+                    VPTransformState &State);
 
   /// Iteratively sink the scalarized operands of a predicated instruction into
   /// the block that was created for it.
@@ -2742,8 +2742,7 @@ InnerLoopVectorizer::createVectorizedLoopSkeleton(
 void InnerLoopVectorizer::fixupIVUsers(PHINode *OrigPhi,
                                        const InductionDescriptor &II,
                                        Value *VectorTripCount, Value *EndValue,
-                                       BasicBlock *MiddleBlock,
-                                       BasicBlock *VectorHeader, VPlan &Plan,
+                                       BasicBlock *MiddleBlock, VPlan &Plan,
                                        VPTransformState &State) {
   // There are two kinds of external IV usages - those that use the value
   // computed in the last iteration (the PHI) and those that use the penultimate
@@ -2954,8 +2953,7 @@ void InnerLoopVectorizer::fixVectorizedLoop(VPTransformState &State,
     for (const auto &Entry : Legal->getInductionVars())
       fixupIVUsers(Entry.first, Entry.second,
                    getOrCreateVectorTripCount(VectorLoop->getLoopPreheader()),
-                   IVEndValues[Entry.first], LoopMiddleBlock,
-                   VectorLoop->getHeader(), Plan, State);
+                   IVEndValues[Entry.first], LoopMiddleBlock, Plan, State);
   }
 
   // Fix live-out phis not already fixed earlier.