hg: jdk/sandbox: 8213399: DecoderLocker is unused

[chris.hegarty at oracle.com]

Changeset: afce4a27f2c2
Author:    coleenp
Date:      2019-05-01 07:12 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/afce4a27f2c2

8213399: DecoderLocker is unused
Summary: remove DecoderLocker
Reviewed-by: iklam, dholmes

! src/hotspot/share/utilities/decoder.cpp
! src/hotspot/share/utilities/decoder.hpp