Add missing virtual destructor on TIntermAggregateBase
Add missing virtual destructor on TIntermAggregateBase

BUG=angleproject:1490
TEST=build on Linux GCC

Change-Id: I64f53d636d4acee0469b6e9ba1201322087d5f65
Reviewed-on: https://chromium-review.googlesource.com/395732
Reviewed-by: Olli Etuaho <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>
Commit-Queue: Olli Etuaho <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>

ecoal95/angle,ppy/angle,MSOpenTech/angle,ecoal95/angle,ecoal95/angle,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle,MSOpenTech/angle,ppy/angle,ppy/angle,ppy/angle,ecoal95/angle