extend consumer fuse to nested scf loop (v2)

Author: Yun-Fly

mlir/include/mlir/Dialect/SCF/Transforms/TileUsingInterface.h

@@ -254,6 +254,10 @@ struct SCFFuseConsumerOfSliceResult {
       *tiledAndFusedConsumerOperand; // Tiled and fused consumer's operand.
   SmallVector<Operation *> tiledOps;
 };
+FailureOr<scf::SCFFuseConsumerOfSliceResult>
+tileAndFuseConsumerOfSliceImpl(RewriterBase &rewriter,
+                               Operation *candidateSliceOp);
+
 FailureOr<scf::SCFFuseConsumerOfSliceResult>
 tileAndFuseConsumerOfSlice(RewriterBase &rewriter, Operation *candidateSliceOp);