test parsing and printing quoted and escaped key in dialect_resources

Author: sorenlassen

mlir/test/IR/dense-resource-elements-attr.mlir

@@ -11,3 +11,18 @@
     }
   }
 #-}
+
+// -----
+
+// DenseResourceElementsHandle key blob\-"one" is quoted and escaped.
+// CHECK: attr = dense_resource<"blob\\-\22one\22"> : tensor<2xi16>
+"test.user_op"() {attr = dense_resource<"blob\\-\22one\22"> : tensor<2xi16>} : () -> ()
+
+{-#
+  dialect_resources: {
+    builtin: {
+      // CHECK: "blob\\-\22one\22": "0x0200000001000200"
+      "blob\\-\22one\22": "0x0200000001000200"
+    }
+  }
+#-}