[ORC][llvm-jitlink] Extend weak-linking emulation to real dylibs. Commit 253e11695ba added support for emulating weak-linking against dylibs that are (under the emulation) absent at runtime. This commit extends emulated weak linking support to allow a real dylib to supply the interface (i.e. -weak-lx / -weak_library can be pointed at a dylib, in which case they should be read as "weak-link against this dylib, behavining as if it weren't actually present at runtime").
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