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08c5f1fede
Adds a function to create a LinkGraph of absolute symbols, and a callback in dynamic library search generators to enable using it to expose its symbols to the platform/orc runtime. This allows e.g. using __orc_rt_run_program to run a precompiled function that was found via dlsym. Ideally we would use this in llvm-jitlink's own search generator, but it will require more work to align with the Process/Platform JITDylib split, so not handled here. As part of this change we need to handle LinkGraphs that only have absolute symbols.