Move most of addBinaryMath from Intermediate to ParseContext Some type checks for binary math will be different based on the shading language version, which is easily accessible in ParseContext. Because of this and also for architectural simplicity it makes more sense to have the checks in ParseContext. BUG=angle:941 TEST=angle_unittests, WebGL conformance tests Change-Id: I92a499f47e1cbc6a7b6391ce0fa04284803e7140 Reviewed-on: https://chromium-review.googlesource.com/260570 Tested-by: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Zhenyao Mo <zmo@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>