hg: jdk/sandbox: 8208575: Remove Atomic::add/sub for short

[chris.hegarty at oracle.com]

Changeset: edd33b9946ca
Author:    coleenp
Date:      2018-08-07 19:35 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/edd33b9946ca

8208575: Remove Atomic::add/sub for short
Summary: Removed code to atomic::add for short because it's no longer used for Symbol.
Reviewed-by: iklam

! src/hotspot/share/runtime/atomic.hpp
! src/hotspot/share/utilities/macros.hpp