Change test to use regex instead of explicit value numbers. NFC.

We were seeing an internal failure when running this test.  I can't
see a good reason for the difference, but the simple fix is to use
%{{.*}} instead of %1.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@268416 91177308-0d34-0410-b5e6-96231b3b80d8