PR240990: linux: handle the CLOCK_{PROCESS,THREAD}_CPUTIME_ID specified directly

[dchagin]

Summary

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240990

Handle the most obvious case of CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID clocks specified directly, using LINUX_CPU_SCHED (that is, kern_clock_gettime()).

Test Plan

Run the test case attached to the PR compiled natively, under linux emulation, and on Debian GNU/Linux (system specs are identical), all results are nearly the same.

[trasz]

Ping? Is there anything left to do here before committing? Did you have a chance to test it with LTP (linux-c7-ltp package)?

[dchagin]

hi, could u please test D23339, D23340,D23341?