pan/bi: Add copy for register COMBINEs

Fixes:

dEQP-GLES2.functional.shaders.loops.for_constant_iterations.infinite_with_conditional_break_fragment

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7081>
1 file changed