[mlir][Linalg] Add method to check if LinalgTransformationFilter has been applied.

mlir/include/mlir/Dialect/Linalg/Transforms/Transforms.h

explicit LinalgTransformationFilter(
       FilterFunction f, ArrayRef<StringAttr> matchDisjunction = {},
       Optional<StringAttr> replacement = None);
 
   LinalgTransformationFilter(LinalgTransformationFilter &&) = default;
   LinalgTransformationFilter(const LinalgTransformationFilter &) = default;
   LogicalResult checkAndNotify(PatternRewriter &rewriter, Operation *op) const;
   void replaceLinalgTransformationFilter(PatternRewriter &rewriter,
                                          Operation *op) const;
+  bool hasReplacementFilter(Operation *op) const;
 
   LinalgTransformationFilter &addFilter(FilterFunction f) {
     if (f)
       filters.push_back(f);
     return *this;
   }
   template <typename... OpTypes>
   LinalgTransformationFilter &addOpFilter() {

mlir/lib/Dialect/Linalg/Transforms/Transforms.cpp

void mlir::linalg::LinalgTransformationFilter::
   if (replacement.hasValue())
     op->setAttr(LinalgTransforms::kLinalgTransformMarker,
                 replacement.getValue());
   else
     op->removeAttr(
         rewriter.getStringAttr(LinalgTransforms::kLinalgTransformMarker));
 }
 
+bool mlir::linalg::LinalgTransformationFilter::hasReplacementFilter(
+    Operation *op) const {
+  if (!replacement)
+    return false;
+  auto attr = op->getAttr(LinalgTransforms::kLinalgTransformMarker)
+                  .dyn_cast<StringAttr>();
+  return attr && attr == replacement.getValue();
+}
+
 LinalgTilingOptions &
 mlir::linalg::LinalgTilingOptions::setTileSizes(ArrayRef<int64_t> ts) {
   assert(!tileSizeComputationFunction && "tile sizes already set");
   SmallVector<int64_t, 4> tileSizes(ts.begin(), ts.end());
   tileSizeComputationFunction = [tileSizes](OpBuilder &b, Operation *op) {
     OpBuilder::InsertionGuard guard(b);
     b.setInsertionPointToStart(
         &op->getParentOfType<FuncOp>().getBody().front());