Update testcase since llvm-dwarfdump got more accurate in r355148.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355150 91177308-0d34-0410-b5e6-96231b3b80d8

test/DebugInfo/Generic/virtual-index.ll

@@ -17,7 +17,7 @@
 ; 4294967295.
 
 ; CHECK: DW_TAG_subprogram [
-; CHECK: DW_AT_vtable_elem_location [DW_FORM_exprloc]  (<0x2> 10 00 )
+; CHECK: DW_AT_vtable_elem_location [DW_FORM_exprloc]  (DW_OP_constu 0x0)
 
 ; CHECK: DW_TAG_subprogram [
 ; CHECK-NOT: DW_AT_vtable_elem_location