[ArgPromote] Actually add FileCheck to a test that I actually updated to
have nice CHECK patterns instead of relying on a coarse 'not grep'
check. Sorry that I missed this the first time through.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294422 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed