freedreno: Misc cleanup

Some whitespace cleanup + comment addition.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8795>

src/gallium/drivers/freedreno/ir3/ir3_gallium.c

@@ -225,6 +225,7 @@ ir3_shader_create(struct ir3_compiler *compiler,
 		ir3_shader_variant(shader, key, false, debug);
 	}
 
+	/* For vertex shaders, also compile initial binning pass shader: */
 	if (nir->info.stage == MESA_SHADER_VERTEX) {
 		key.safe_constlen = false;
 		v = ir3_shader_variant(shader, key, true, debug);