spirv: Flip the tessellation winding order

It's not SPIR-V that's backwards from GLSL, it's Vulkan that's backwards
from GL.  Let's make NIR consistent with the source language and do the
flipping inside the Vulkan driver instead.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/amd/vulkan/radv_pipeline.c

@@ -262,6 +262,7 @@ radv_tess_pipeline_compile(struct radv_pipeline *pipeline,
 	if (tcs_nir == NULL)
 		return;
 
+	tes_nir->info.tess.ccw = !tes_nir->info.tess.ccw;
 	nir_lower_tes_patch_vertices(tes_nir,
 				     tcs_nir->info.tess.tcs_vertices_out);