message: Update MemRefAccess::getAccessMap to always canonicalize map + operands
  with this we won't see duplicate / unused operands when getting access maps,
  or when constructing FlatAffineConstraints based on such maps
  we can probably change fullyComposeAffineMapAndOperands to ensure this
  TODO(b/123879896).
diff: @@ -1179,6 +1179,7 @@ void MemRefAccess::getAccessMap(AffineValueMap *accessMap) const {
  memref->getType().getContext());
  SmallVector<Value *, 8> operands(indices.begin(), indices.end());
  fullyComposeAffineMapAndOperands(&map, &operands);
  + canonicalizeMapAndOperands(&map, &operands);
  accessMap->reset(map, operands);
  }
  