[MLIR][NFC] Remove unused argument in affine scalrep helper util

[bondhugula]

Summary

NFC. Remove unused argument in affine scalrep helper utility.

mlir/lib/Dialect/Affine/Utils/Utils.cpp

 
 // This attempts to find stores which have no impact on the final result.
 // A writing op writeA will be eliminated if there exists an op writeB if
 // 1) writeA and writeB have mathematically equivalent affine access functions.
 // 2) writeB postdominates writeA.
 // 3) There is no potential read between writeA and writeB.
 static void findUnusedStore(AffineWriteOpInterface writeA,
                             SmallVectorImpl<Operation *> &opsToErase,
-                            SmallPtrSetImpl<Value> &memrefsToErase,
                             PostDominanceInfo &postDominanceInfo) {
 
   for (Operation *user : writeA.getMemRef().getUsers()) {
     // Only consider writing operations.
     auto writeB = dyn_cast<AffineWriteOpInterface>(user);
     if (!writeB)
       continue;
 
void mlir::affineScalarReplace(FuncOp f, DominanceInfo &domInfo,
 
   // Erase all load op's whose results were replaced with store fwd'ed ones.
   for (auto *op : opsToErase)
     op->erase();
   opsToErase.clear();
 
   // Walk all store's and perform unused store elimination
   f.walk([&](AffineWriteOpInterface storeOp) {
-    findUnusedStore(storeOp, opsToErase, memrefsToErase, postDomInfo);
+    findUnusedStore(storeOp, opsToErase, postDomInfo);
   });
   // Erase all store op's which don't impact the program
   for (auto *op : opsToErase)
     op->erase();
 
   // Check if the store fwd'ed memrefs are now left with only stores and can
   // thus be completely deleted. Note: the canonicalize pass should be able
   // to do this as well, but we'll do it here since we collected these anyway.