gallium/draw: Enable polygon stipple NIR helpers to generate bool1 or bool32 Booleans
It appears that only softpipe, llvmpipe, and d3d12 hit any of this
code. If some NIR-to-TGSI driver that doesn't have native integers
(e.g., i915 or r300) wants to use this path in the future, it should be
easy to add float32 support.
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20869>