[x86] fix over-specific triple; NFC

There's nothing darwin-specific in these tests, and using that 
setting causes extra phantom diffs when the auto-generated check 
lines are regenerated today.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304753 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed