Check that we have an unknown upper bound range for our flexible array members.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157305 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/debug-info-vla-range.cpp

 // RUN: %clang_cc1 -emit-llvm -g -triple x86_64-apple-darwin %s -o - | FileCheck %s
 
-// CHECK: DW_TAG_subrange_type
+// CHECK: metadata !{i32 {{.*}}, i64 1, i64 0}        ; [ DW_TAG_subrange_type ]
 
 struct StructName {
   int member[];