Fix length() translation for clip/cull distance arrays * Fixed a failing assertion when the arrays are resized. * Added a compile error for length() when the arrays are unsized. Fixed: angleproject:8527 Change-Id: I6379336c546b008095f0875e5b5b4e8e0e5ba3e6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5293914 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>