nvk: Always copy conditional rendering value before compare
The spec requires a compare on 32-bit but the hardware actually compare 64-bit.
As such, we are required to copy the value to a temporary buffer before the compare.
This fixes new failures introduced by VKCTS 1.3.8.0 new tests:
dEQP-VK.conditional_rendering.transform_feedback.draw
dEQP-VK.conditional_rendering.transform_feedback.draw_indexed
dEQP-VK.conditional_rendering.transform_feedback.draw_indexed_indirect
dEQP-VK.conditional_rendering.transform_feedback.draw_indexed_indirect_count
dEQP-VK.conditional_rendering.transform_feedback.draw_indirect
dEQP-VK.conditional_rendering.transform_feedback.draw_indirect_byte_count_ext
dEQP-VK.conditional_rendering.transform_feedback.draw_indirect_count
dEQP-VK.conditional_rendering.transform_feedback.draw_multi_ext
dEQP-VK.conditional_rendering.transform_feedback.draw_multi_indexed_ext