Fix setting array sizes on a constructor Take any array sizes that have been explicitly specified in the shader text into account, and only set the ones that are unsized according to the arguments. BUG=angleproject:2125 TEST=angle_unittests Change-Id: I37d08a86c25f7cd4f3ce5689f2c9fad444e7d5ad Reviewed-on: https://chromium-review.googlesource.com/738141 Commit-Queue: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Corentin Wallez <cwallez@chromium.org>