[JITLink] Add llvm-jitlink to the list of available tools in lit.

Should fix the 'llvm-jitlink command not found' errors that are appearing on
some builders.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358828 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed