[X86] Remove outdated test

This test breaks the X86 MachineVerifier. It looks like the MIR part is
completely useless.

The original author suggests that it can be removed.

Differential Revision: https://reviews.llvm.org/D53767

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345501 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed