This prevents confusion between "TIntermediate" and "TIntermNode".

BUG=angle:711

Change-Id: Ib7a086382a479db3f77bf2ab06ce321aa7b35d13
Reviewed-on: https://chromium-review.googlesource.com/212936Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Nicolas Capens <capn@chromium.org>