[X86] Add avx command lines to two fast-isel tests to get coverage of selecting vucomiss/vucomisd.

The selection of these shows up as a code coverage hole when looking at the llvm-cov link on llvm.org

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316823 91177308-0d34-0410-b5e6-96231b3b80d8

Author: topperc