[X86] Fix test/MC/AsmParser/exprs-invalid.s after rL336104

This was my mistake for only running test/MC/X86 and test/CodeGen/X86. 
Arguably .word should be removed from this test, as it is not supported 
universally.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336107 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed