Started after SwiftShader enabled ASTC in
https://swiftshader-review.googlesource.com/c/SwiftShader/+/41568

Bug: angleproject:4447
Change-Id: I251ff26d4972f17f1f76f8ad1df57dc9c539782c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2078755Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>