Add line number to assertion

Author: jofrn

llvm/test/TableGen/submulticlass-typecheck.td

@@ -1,6 +1,6 @@
 // RUN: not llvm-tblgen %s 2>&1 | FileCheck %s
 // XFAIL: vg_leak
-// CHECK: {{.*}}: error: Value specified for template argument 'B::op' is of type bits<4>; expected type bits<8>: C::op
+// CHECK: {{.*}}:11:28: error: Value specified for template argument 'B::op' is of type bits<4>; expected type bits<8>: C::op
 // CHECK-NEXT: multiclass C<bits<4> op> : B<op>;
 class A<bits<8> op> {
   bits<8> f = op;