Make modules.m test portable, now that autolinking is dependent on whether or...

Make modules.m test portable, now that autolinking is dependent on whether or not the target uses the integrated assembler.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176902 91177308-0d34-0410-b5e6-96231b3b80d8