Use sched_yield in Monitor::MonitorEnter.

Previously we used NanoSleep(1000), but this was unreliable. It could
result in waiting for >= 40ms instead of 1us. Since this was in a loop
it was especially bad if the GC was trying to suspend all the
threads when we were sleeping. This resulted in thread suspension
occasionally taking longer than a second.
Results on the provided picasso-sample app on Nexus 5:
Longest GC pause before: ~1.5s.
Longest GC pause after: <5ms.

Also added a warning if thread suspension takes longer than a
threshold (currently 5ms).

Bug: 16307460
External bug:

Change-Id: I3c2a9636357e255f38634615101eff8ca84e632f
2 files changed