git: openjdk/mobile: 8237756: Backout: JDK-8230594: Allow direct handshakes without VMThread intervention

[duke]

Changeset: 5e9d3fdc
Author:    Patricio Chilano Mateo <pchilanomate at openjdk.org>
Date:      2020-01-23 17:26:52 +0000
URL:       https://git.openjdk.java.net/mobile/commit/5e9d3fdc

8237756: Backout: JDK-8230594: Allow direct handshakes without VMThread intervention

Backout JDK-8230594

Reviewed-by: coleenp, dcubed

! src/hotspot/share/runtime/biasedLocking.cpp
! src/hotspot/share/runtime/handshake.cpp
! src/hotspot/share/runtime/handshake.hpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/safepoint.cpp
! src/hotspot/share/runtime/safepointMechanism.inline.hpp
! src/hotspot/share/runtime/thread.cpp
! src/hotspot/share/runtime/thread.hpp
- test/hotspot/jtreg/runtime/handshake/HandshakeDirectTest.java