Check array index against unsigned array size Fix an assert during GLSL parsing when a very large array (~1U) type is indexed. Bug: angleproject:8596 Change-Id: I219ac5c8f3fa58aa4c7d679eade6f32b59eb1103 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5352653 Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Kimmo Kinnunen <kkinnunen@apple.com>