RFR(S): 8034797 : AIX: Fix os::naked_short_sleep() in os_aix.cpp after 8028280

[Volker Simonis]

Hi,

could you please review this small change which imlements
os::naked_short_sleep(jlong ms) on AIX after this was introduced by
change "8028280: ParkEvent leak when running modified runThese which
only loads classes"
(http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/5944dba4badc) in
the hs-rt repository:

http://cr.openjdk.java.net/~simonis/webrevs/8034797/
https://bugs.openjdk.java.net/browse/JDK-8034797

Special care should be taken when pushing this change. I.e. the change
is intended for hs-comp, but it shouldn't be pushed to hs-comp before
hs-comp has synced change 8028280 from hs-rt.

Thank you and best regards,
Volker