[llvm] [ORC-RT] Initial check-in for a new, top-level ORC runtime project. (PR #113499)

[Vassil Vassilev via llvm-commits]

vgvassilev wrote:

@lhames, could you rebase this PR. If we get a green ci I think we can move forward. 

https://github.com/llvm/llvm-project/pull/113499