Updated test/create_ll.sh to work with old & new clang versions.

We explicitly specifying all filenames instead of assuming some naming
convention used by clang and opt.

Contributed-by: Johannes Doerfert <doerfert@cs.uni-saarland.de>

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@204726 91177308-0d34-0410-b5e6-96231b3b80d8