patch 9.0.1074: class members are not supported yet

Problem:    Class members are not supported yet.
Solution:   Add initial support for class members.
diff --git a/src/vim9expr.c b/src/vim9expr.c
index 6c9385c..7ec3ee9 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -278,17 +278,16 @@
     {
 	for (int i = 0; i < cl->class_obj_member_count; ++i)
 	{
-	    objmember_T *m = &cl->class_obj_members[i];
-	    if (STRNCMP(name, m->om_name, len) == 0 && m->om_name[len] == NUL)
+	    ocmember_T *m = &cl->class_obj_members[i];
+	    if (STRNCMP(name, m->ocm_name, len) == 0 && m->ocm_name[len] == NUL)
 	    {
 		if (*name == '_' && cctx->ctx_ufunc->uf_class != cl)
 		{
-		    semsg(_(e_cannot_access_private_object_member_str),
-								   m->om_name);
+		    semsg(_(e_cannot_access_private_member_str), m->ocm_name);
 		    return FAIL;
 		}
 
-		generate_GET_OBJ_MEMBER(cctx, i, m->om_type);
+		generate_GET_OBJ_MEMBER(cctx, i, m->ocm_type);
 
 		*arg = name_end;
 		return OK;