git: openjdk/jdk: 8271348: Add stronger sanity check of thread state when polling for safepoint/handshakes

[Daniel D.Daugherty]

Changeset: db950ca4
Author:    Daniel D. Daugherty <dcubed at openjdk.org>
Date:      2021-08-02 16:00:13 +0000
URL:       https://git.openjdk.java.net/jdk/commit/db950ca41f3ab7823fa221e8e3f63caf3dd51ea3

8271348: Add stronger sanity check of thread state when polling for safepoint/handshakes

Co-authored-by: Patricio Chilano Mateo <pchilanomate at openjdk.org>
Reviewed-by: dholmes, pchilanomate

! src/hotspot/share/runtime/safepoint.cpp
! src/hotspot/share/runtime/safepoint.hpp
! src/hotspot/share/runtime/safepointMechanism.cpp