Don't use "llc -filetype=obj" now that the codepath is the same.

r200011 remove the special codepaths in MC for inline asm, so we can now test
all the logic with just llc + llvm-mc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200013 91177308-0d34-0410-b5e6-96231b3b80d8