This changes the grammar so that multiple array sizes can be chained
together, and adds arrays of arrays support to TPublicType. In
TPublicType the array sizes are stored using a pointer to a vector, a
plain vector won't work due to bison restrictions.

A larger subset of program interface query tests now pass. Some are
still failing due to unrelated bugs.

BUG=angleproject:2125
TEST=angle_unittests, angle_end2end_tests,
     dEQP-GLES31.functional.shaders.arrays_of_arrays.*
     dEQP-GLES31.functional.uniform_location.nested_array.*
     dEQP-GLES31.functional.program_interface_query.*
     dEQP-GLES31.functional.ubo.*level*array.*

Change-Id: Iee16477a3752b953f5068c0473a2ed62fead8155
Reviewed-on: https://chromium-review.googlesource.com/633944
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>