Added a dynamic check for VectorType.

When the result is not a vectorType, there is an assert.
This patch will do the check and bail when the result is
not a VectorType.

Author: bviyer

mlir/lib/Dialect/Vector/Transforms/VectorLinearize.cpp

@@ -22,9 +22,9 @@ using namespace mlir;
 static bool isLessThanTargetBitWidth(Operation *op, unsigned targetBitWidth) {
   auto resultTypes = op->getResultTypes();
   for (auto resType : resultTypes) {
-    VectorType vecType = cast<VectorType>(resType);
+    VectorType vecType = dyn_cast<VectorType>(resType);
     // Reject index since getElementTypeBitWidth will abort for Index types.
-    if (vecType.getElementType().isIndex())
+    if (!vecType || vecType.getElementType().isIndex())
       return false;
     unsigned trailingVecDimBitWidth =
         vecType.getShape().back() * vecType.getElementTypeBitWidth();