llvm-project

3051ae0b - [libc] Implement getpriority, setpriority, their unit tests; add the accompanying macros and type headers. (#219573)

[libc] Implement getpriority, setpriority, their unit tests; add the accompanying macros and type headers. (#219573) Testing these is a bit tricky, so: - For `getpriority`, ensure the call succeeds and round-trip the highest nice value on Linux (19). - For `setpriority`, ensure the call succeeds when setting it to the current nice. - For both, test two failure modes that are easy to stably induce.