[ORC] Add a createJITDylib method to LLJIT.

Because I'm about to get on stage at the dev meeting and claim that it exists.

This method creates a JITDylib instance with the given name and returns a
reference to it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344763 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed