panfrost: Route stack_size from compiler

We'll need it in pan_context.c

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

src/gallium/drivers/panfrost/pan_assemble.c

         state->writes_point_size = program.writes_point_size;
         state->reads_point_coord = false;
         state->helper_invocations = s->info.fs.needs_helper_invocations;
+        state->stack_size = program.tls_size;
 
         if (outputs_written)
                 *outputs_written = s->info.outputs_written;

src/gallium/drivers/panfrost/pan_context.h

         bool reads_point_coord;
         bool reads_face;
         bool reads_frag_coord;
+        unsigned stack_size;
 
         struct mali_attr_meta varyings[PIPE_MAX_ATTRIBS];
         gl_varying_slot varyings_loc[PIPE_MAX_ATTRIBS];