[X86] Remove the XFAILed test added in r348620

It seems to be unexpectedly passing on some bots probably because it requires asserts to fail, but doesn't say that. But we already have a patch in review to make it not xfail so I'd rather just focus on getting it passing rather than trying to figure out an unexpected pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348661 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed