[LAA] Remove unused OrigPtr from replaceSymbolicStrideSCEV (NFC).

The OrigPtr argument is not used in tree.

Author: fhahn

llvm/include/llvm/Analysis/LoopAccessAnalysis.h

@@ -664,12 +664,11 @@ Value *stripIntegerCast(Value *V);
 /// If necessary this method will version the stride of the pointer according
 /// to \p PtrToStride and therefore add further predicates to \p PSE.
 ///
-/// If \p OrigPtr is not null, use it to look up the stride value instead of \p
-/// Ptr.  \p PtrToStride provides the mapping between the pointer value and its
+/// \p PtrToStride provides the mapping between the pointer value and its
 /// stride as collected by LoopVectorizationLegality::collectStridedAccess.
 const SCEV *replaceSymbolicStrideSCEV(PredicatedScalarEvolution &PSE,
                                       const ValueToValueMap &PtrToStride,
-                                      Value *Ptr, Value *OrigPtr = nullptr);
+                                      Value *Ptr);
 
 /// If the pointer has a constant stride return it in units of its
 /// element size.  Otherwise return zero.

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -142,13 +142,12 @@ Value *llvm::stripIntegerCast(Value *V) {
 
 const SCEV *llvm::replaceSymbolicStrideSCEV(PredicatedScalarEvolution &PSE,
                                             const ValueToValueMap &PtrToStride,
-                                            Value *Ptr, Value *OrigPtr) {
+                                            Value *Ptr) {
   const SCEV *OrigSCEV = PSE.getSCEV(Ptr);
 
   // If there is an entry in the map return the SCEV of the pointer with the
   // symbolic stride replaced by one.
-  ValueToValueMap::const_iterator SI =
-      PtrToStride.find(OrigPtr ? OrigPtr : Ptr);
+  ValueToValueMap::const_iterator SI = PtrToStride.find(Ptr);
   if (SI == PtrToStride.end())
     // For a non-symbolic stride, just return the original expression.
     return OrigSCEV;