[llvm] [ORC] Introduce RedirectionManager interface and implementation using JITLink. (PR #66802)

[Stefan Gränitz via llvm-commits]

weliveindetail wrote:

What are the prospects for this PR? Do we want to land it in some form? I rebased it to mainline and with some minor fixes the test passes. Now that release/18.x has branched, we'd have some time to revisit it and stabilize it. What do you think?

One thing I'd like to discuss is how we can separate management of symbols from stubs. We [have an IndirectStubsManager](https://github.com/llvm/llvm-project/blob/release/18.x/llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h#L281) that we use for lazy JITing and it's already [wired up with EPC](https://github.com/llvm/llvm-project/blob/release/18.x/llvm/lib/ExecutionEngine/Orc/EPCIndirectionUtils.cpp#L54) right?

Can we integrate it in the redirection manager and avoid more stub management?

https://github.com/llvm/llvm-project/pull/66802