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broadcom/compiler: don't promote early fragment tests when writing sample mask

Iago Toral requested to merge itoral/mesa:v3d_fix_early_frag_test_promotion_with_sample_mask into main

If the sample mask is being written it means we want to discard some of the samples generated so we should not be promoting the fragment shader to do early tests, since that would not take into account the sample mask written from the shader.

Fixes: dEQP-VK.fragment_operations.early_fragment.sample_count_early_fragment_tests_depth_samples_4

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