To match behavior of ALOGV in Android system code, disable output
in release builds.

Bug=angleproject:2418

Change-Id: I657ec366249f9d5defe9b05fe298099c47389580
Reviewed-on: https://chromium-review.googlesource.com/c/1269819Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>