hg: jdk/hs: 8198635: Remove unused safepoint message functions and ShowSafepointMsgs

[coleen.phillimore at oracle.com]

Changeset: a6b6a428c915
Author:    coleenp
Date:      2018-02-23 14:13 -0500
URL:       http://hg.openjdk.java.net/jdk/hs/rev/a6b6a428c915

8198635: Remove unused safepoint message functions and ShowSafepointMsgs
Reviewed-by: eosterlund, gtriantafill

! src/hotspot/share/runtime/arguments.cpp
! src/hotspot/share/runtime/globals.hpp
! src/hotspot/share/runtime/safepoint.cpp
! src/hotspot/share/runtime/safepoint.hpp
! src/hotspot/share/utilities/debug.cpp