py/objmodule: Make mp_obj_module_get_globals an inline function.

Because this function is simple it saves code size to have it inlined.
Being an auxiliary helper function (and only used in the py/ core) the
argument should always be an mp_obj_module_t*, so there's no need for the
assert (and having it would require including assert.h in obj.h).

py/obj.h

@@ -804,7 +804,9 @@ typedef struct _mp_obj_module_t {
     mp_obj_base_t base;
     mp_obj_dict_t *globals;
 } mp_obj_module_t;
-mp_obj_dict_t *mp_obj_module_get_globals(mp_obj_t self_in);
+static inline mp_obj_dict_t *mp_obj_module_get_globals(mp_obj_t module) {
+    return ((mp_obj_module_t*)MP_OBJ_TO_PTR(module))->globals;
+}
 // check if given module object is a package
 bool mp_obj_is_package(mp_obj_t module);
 

py/objmodule.c

@@ -122,12 +122,6 @@ mp_obj_t mp_obj_new_module(qstr module_name) {
     return MP_OBJ_FROM_PTR(o);
 }
 
-mp_obj_dict_t *mp_obj_module_get_globals(mp_obj_t self_in) {
-    assert(MP_OBJ_IS_TYPE(self_in, &mp_type_module));
-    mp_obj_module_t *self = MP_OBJ_TO_PTR(self_in);
-    return self->globals;
-}
-
 /******************************************************************************/
 // Global module table and related functions