RFR: Backport of JDK-8040140 System.nanoTime() is slow and non-monotonic on OS X

[Staffan Larsen]

The backport of the fix for 8040140 did not apply cleanly to jdk8u/hs-dev, so I’m requesting a review of the changes. The one thing that I had to change was that the function supports_monotonic_clock() had moved in jdk9 from bsd.hpp to bsd.inline.hpp

bug: https://bugs.openjdk.java.net/browse/JDK-8040140
webrev for jdk8u: http://cr.openjdk.java.net/~sla/8040640/webrev.00/

For reference:
webrev for jdk9: http://cr.openjdk.java.net/~sla/8040140/webrev.04/

Thanks,
/Staffan