broadcom/vc5: Clamp the instance divisor to 16 bits.

Fixes debug assert on
GTF-GLES3.gtf.GL3Tests.instanced_arrays.instanced_arrays_divisor

Signed-off-by: Eric Anholt <eric@anholt.net>

src/gallium/drivers/vc5/vc5_state.c

@@ -319,7 +319,8 @@ vc5_vertex_state_create(struct pipe_context *pctx, unsigned num_elements,
 
                         attr.normalized_int_type = desc->channel[0].normalized;
                         attr.read_as_int_uint = desc->channel[0].pure_integer;
-                        attr.instance_divisor = elem->instance_divisor;
+                        attr.instance_divisor = MIN2(elem->instance_divisor,
+                                                     0xffff);
 
                         switch (desc->channel[0].type) {
                         case UTIL_FORMAT_TYPE_FLOAT: