This is needed in order to make symbol table symbols statically
allocated.

BUG=angleproject:2267
TEST=angle_unittests

Change-Id: Ia2d44fb30d49dc5d5c67643fe01280c89127a3c3
Reviewed-on: https://chromium-review.googlesource.com/889299Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>