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MaterializationResponsibility. MaterializationResponsibility objects provide a connection between a materialization process (compiler, jit linker, etc.) and the JIT state held in the ExecutionSession and JITDylib objects. Switching to shared ownership extends the lifetime of JITDylibs to ensure they remain accessible until all materializers targeting them have completed. This will allow (in a follow-up patch) JITDylibs to be removed from the ExecutionSession and placed in a pending-destruction state while they are kept alive to communicate errors to/from any still-runnning materialization processes. The intent is to enable JITDylibs to be safely removed even if they have running compiles targeting them.
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