hg: jdk/sandbox: 8214144: Remove confusing locking_enqueue_completed_buffer

[chris.hegarty at oracle.com]

Changeset: 0877040ec224
Author:    kbarrett
Date:      2018-11-21 09:40 -0500
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/0877040ec224

8214144: Remove confusing locking_enqueue_completed_buffer
Summary: Remove function.
Reviewed-by: tschatzl, manc

! src/hotspot/share/gc/shared/ptrQueue.cpp
! src/hotspot/share/gc/shared/ptrQueue.hpp