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Draft: i965: Fix downloads of ASTC void-extent blocks on big-core gen9

Nanley Chery requested to merge nchery/mesa:sent/fix/astc-wa-v2 into main

Instead of modifying the ASTC miptree data on texture upload, store the modified data in a shadow miptree that is sometimes used for sampling.

Makes the following piglit test pass on big-core gen9 platforms: spec@khr_texture_compression_astc@void-extent-dl-bug

Mentioned in: kwg/mesa#38 (moved)

Edited by Jordan Justen

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