hg: jdk/jdk10: 8194258: PPC64 safepoint mechanism: Fix initialization on AIX and support SIGTRAP

[robbin.ehn at oracle.com]

Changeset: 478e77658965
Author:    mdoerr
Date:      2018-01-10 11:09 +0100
URL:       http://hg.openjdk.java.net/jdk/jdk10/rev/478e77658965

8194258: PPC64 safepoint mechanism: Fix initialization on AIX and support SIGTRAP
Summary: Use mmap on AIX to allocate protected page. Use trap instructions for polling if UseSIGTRAP is enabled.
Reviewed-by: rehn, goetz

! src/hotspot/cpu/ppc/globalDefinitions_ppc.hpp
! src/hotspot/cpu/ppc/macroAssembler_ppc.inline.hpp
! src/hotspot/cpu/ppc/nativeInst_ppc.hpp
! src/hotspot/os/aix/safepointMechanism_aix.cpp
! src/hotspot/os_cpu/aix_ppc/os_aix_ppc.cpp
! src/hotspot/os_cpu/linux_ppc/os_linux_ppc.cpp
! src/hotspot/share/runtime/safepointMechanism.cpp
! test/hotspot/jtreg/runtime/logging/OsCpuLoggingTest.java