hg: shenandoah/jdk8/hotspot: Enable weak JNI handling with Shenandoah after JDK-8176100

[shade at redhat.com]

Changeset: 4a075d6cc009
Author:    shade
Date:      2019-06-12 20:03 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/4a075d6cc009

Enable weak JNI handling with Shenandoah after JDK-8176100

! src/cpu/aarch64/vm/sharedRuntime_aarch64.cpp
! src/cpu/aarch64/vm/templateInterpreter_aarch64.cpp
! src/cpu/x86/vm/macroAssembler_x86.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahRootProcessor.cpp
! src/share/vm/runtime/jniHandles.cpp