Fix destructing TStrings through BuiltInFunctionEmulator after free BuiltInFunctionEmulator gets destructed after the PoolAllocator has already freed memory. That's why BuiltInFunctionEmulator can't hold any objects that contain parts stored in the memory pool that would be accessed in its destructor. Use only pointers to TType objects inside BuiltInFunctionEmulator, so that the BuiltInFunctionEmulator destructor doesn't access TStrings which have data in the memory pool. Also fix style issues in BuiltInFunctionEmulator. BUG=angleproject:1010 TEST=dEQP-GLES3.functional.shaders.builtin_functions.* Change-Id: Ic35caf80bf125d0427c2ed2024e98657756103b6 Reviewed-on: https://chromium-review.googlesource.com/272738 Tested-by: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Zhenyao Mo <zmo@chromium.org>