6903614 sys/condvar.h time_res enum should not be visible outside the kernel

PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
6860030 tickless clock requires a clock() decoupled lbolt / lbolt64
Portions contributed by Chad Mynhier <cmynhier@gmail.com>

backout 6265036/6531693: causes 6544953

6265036 cv_waituntil_sig() often returns early

OpenSolaris Launch