Add a test for EXT_texture_swizzle and DEPTH_TEXTURE_MODE together.
This tests every possible DEPTH_TEXTURE_MODE with a random smattering of EXT_texture_swizzle modes. While it could be more exhaustive (or use a more logically ordered layout), it does catch the bugs I wanted to detect. v2: Fix probing bug, minor cleanups based on Brian's feedback. Signed-off-by: Kenneth Graunke <firstname.lastname@example.org>
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