[ArgPromote] Delete a test that makes no sense (any more).

This test is under 'ArgumentPromotion' but there are no arguments that
get promoted in the test case, so there seems to be no point. Also,
there are no assertions about the output at all, so this seems like
something we should just delete given the low value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294428 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed