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clear-stencil: new test to check for problems clearing stencils

Eric Smith requested to merge ericsmith/piglit:clear-stencil into main

On some architectures clearing depth and stencils can be optimized, but tracking the state to know when the stencil has been written is necessary and sometimes has bugs. This test finds a problem with state tracking of stencil clears in an older version of the panfrost driver.

Signed-off-by: Eric R. Smith eric.smith@collabora.com

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