Test failures with lavapipe

[KonstantinSeurer]

• test_null_descriptor_resinfo_dxil and test_null_descriptor_resinfo_dxbc fail when LVP_POISON_MEMORY=1 is set (probably because vkd3d-proton uses an internal buffer when descriptor sets are used). Using the descriptor buffer path with lavapipe makes the tests pass.
• The index buffer in ray tracing tests seems to be wrong (assuming it is supposed to be quads): { 0, 1, 2, 3, 2, 1 } -> { 0, 1, 2, 3, 0, 2 }.

[HansKristian-Work]

Does #2569 fix the RT tests?

[KonstantinSeurer]

Does #2569 fix the RT tests?

It does, thanks.