Clean redundant semicolons from HLSL branch statements Branch statements can only exist inside block nodes. The block node that contains a branch will take care of writing a semicolon after each statement. BUG=angleproject:1013 TEST=angle_end2end_tests Change-Id: Ie5d9077c5d2e090c704282dba39b4d46845cbf1e Reviewed-on: https://chromium-review.googlesource.com/708894 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>