Fix a test case to not depend on asm comment syntax, so as to be portable

Too many different comment characters - instead of trying to account for
them all, instead disable the comments and just check for end-of-line
instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225020 91177308-0d34-0410-b5e6-96231b3b80d8