hg: jdk/sandbox: 8230765: Implement nmethod barrier for x86_32 platforms

[chris.hegarty at oracle.com]

Changeset: 88502b1cf76f
Author:    zgu
Date:      2019-09-09 11:43 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/88502b1cf76f

8230765: Implement nmethod barrier for x86_32 platforms
Reviewed-by: rkennke, eosterlund

! src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp
! src/hotspot/cpu/x86/gc/shared/barrierSetNMethod_x86.cpp
! src/hotspot/cpu/x86/sharedRuntime_x86_32.cpp
! src/hotspot/cpu/x86/stubGenerator_x86_32.cpp
! src/hotspot/cpu/x86/stubRoutines_x86.hpp
! src/hotspot/cpu/x86/stubRoutines_x86_32.cpp
! src/hotspot/share/gc/shared/barrierSetNMethod.cpp
! src/hotspot/share/gc/shared/barrierSetNMethod.hpp
! src/hotspot/share/gc/z/zBarrierSetNMethod.cpp
! src/hotspot/share/gc/z/zBarrierSetNMethod.hpp