hg: jdk8u/jdk8u-dev/hotspot: 8213992: Rename and make DieOnSafepointTimeout the diagnostic option

[zgu at redhat.com]

Changeset: a253fe293726
Author:    zgu
Date:      2018-12-05 16:59 -0500
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/a253fe293726

8213992: Rename and make DieOnSafepointTimeout the diagnostic option
Reviewed-by: dholmes, dcubed, coleenp, kvn

! src/share/vm/runtime/globals.hpp
! src/share/vm/runtime/safepoint.cpp