RFR[9](S): 8036777: AIX: Adapt implementation after '6546236: Thread interrupt() of Thread.sleep() can be lost on Solaris..'

[Volker Simonis]

Hi,

could you please review and push the following little AIX-only change
which adapts the refactorings of  '6546236: Thread interrupt() of
Thread.sleep() can be lost on Solaris..' to AIX:

http://cr.openjdk.java.net/~simonis/webrevs/8036777/
https://bugs.openjdk.java.net/browse/JDK-8036777

The change removes the implementations of os::sleep(), os::interrupt()
and os::is_interrupted() from os_aix.cpp such that AIX now uses the
implementations from os_posix.cpp like the other Unix platfroms and
defines os::supports_monotonic_clock() in os_aix.inline.hpp.

Thank you and best regards,
Volker