Check that block instance name isn't reserved
Check that block instance name isn't reserved

BUG=angleproject:1060
TEST=dEQP-GLES3.functional.shaders.uniform_block.invalid.*

Change-Id: I6de3aa0f714d585e7821798744530f3e51ddee7f
Reviewed-on: https://chromium-review.googlesource.com/284259
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Zhenyao Mo <655bdf1d95ff956cd68886dd9e86ee5e987c9dbb@chromium.org>
Tested-by: Olli Etuaho <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>

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