[cfi-verify] Only run AArch64 tests when it is a supported target

This stops the tests I added in r337007 from running when AArch64 is not a supported target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337012 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed