The GLES GLSL 3.1 spec states that it is an error to use array-of-arrays
in the following cases:

- Vertex shader outputs
- Fragment shader inputs
- Fragment shader outputs

ANGLE currently generates errors in the case of vertex shader inputs.
It needs to add the above cases.

Reproduce by running "angle_deqp_khr_gles31_tests" with:

  --gtest_filter=dEQP.KHR_GLES31/core_arrays_of_arrays_InteractionInterfaceArrays2* --use-angle=swiftshader

Bug: angleproject:4148
Change-Id: I1147fc7d4755e5b6c07d2ab5d14566d919dec530
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2087647Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>