Tessellation control, tessellation evaluation and geometry shader
per-vertex input variables and blocks are required to be declared
as arrays. Ensure these variables meet the requirements and error
out if they don't.

Bug: angleproject:5557
Test: KHR-GLES32.core.tessellation_shader.compilation_and_linking_errors.te_non_arrayed_per_vertex_input_blocks
Change-Id: I0213fcc6fab90dea7597462a65cbbb7777e67108
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2774759
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>