Refactor binary node creation 1. Simplify code by using asserts instead of adding internal errors to log. 2. Add a TIntermBinary constructor that takes left and right operand nodes as parameters. 3. Remove TIntermediate functions with trivial functionality. BUG=angleproject:952 TEST=angle_unittests Change-Id: I2e0e52160c9377d8efcf15f14fd59f01cb41bd83 Reviewed-on: https://chromium-review.googlesource.com/372720 Commit-Queue: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>