Optimize clock_gettime.
#734
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Mark `init_clock` and `init_syscall` (for 32-bit x86) as `#[cold]` so that the compiler moves calls to them out of line. Also, add tests for all the infallible clocks.
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Mark
init_clockandinit_syscall(for 32-bit x86) as#[cold]so that the compiler moves calls to them out of line.Also, add tests for all the infallible clocks.