[libc] Make LIBC_EXIT RPC code use quick exit Summary: This RPC call does the final exiting. The callbacks were handled on the GPU side and this is only 'valid' in the pretend mode where we treat the GPU like a CPU program. Doing this keeps us from crashing and burning if people continue using the program while this is running as `exit` would tear down the offloading library in memory and lead to segfaults. This just drops everything where it is and lets the process manager clean it up for us.
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