Constant-qualify nodes in a consistent way
Constant-qualify nodes in a consistent way

Rely on that constant qualification of binary and unary nodes comes
from promote().

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: Ie8d1d4df3c82ae5a2de8cc536e47016d13a4fd3d
Reviewed-on: https://chromium-review.googlesource.com/377960
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Commit-Queue: Olli Etuaho <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>

ecoal95/angle,ecoal95/angle,ecoal95/angle,ppy/angle,ppy/angle,MSOpenTech/angle,ppy/angle,ppy/angle,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle