Added tensorResultTypeAtIndex to Patterns.h

Need this for LayerNorm

Author: afalkenberg1

include/torch-mlir/Conversion/TorchOnnxToTorch/Patterns.h

@@ -95,6 +95,16 @@ struct OpBinder {
     return success();
   }
 
+  ParseResult tensorResultTypeAtIndex(Torch::ValueTensorType &typeIdx, int64_t idx) {
+    if (idx >= op->getNumResults())
+      return failure();
+    auto t = toValidTensorType(op->getResult(idx).getType());
+    if (!t)
+      return failure();
+    typeIdx = t;
+    return success();
+  }
+
   // Attribute accessors.
   ParseResult s64BoolAttr(bool &value, StringRef nameSuffix,
                           bool defaultValue = false) {