+2019-12-12 Tom Tromey <tom@tromey.com>
+
+ * progspace.c (program_space::add_objfile)
+ (program_space::remove_objfile): Update.
+ (program_space::multi_objfile_p): Remove.
+ * objfiles.h (struct objfile) <next>: Remove.
+ * objfiles.c (objfile::objfile): Update.
+ (put_objfile_before): Update.
+ (unlink_objfile): Update.
+ * progspace.h (object_files): Remove.
+ (struct program_space) <objfiles_head>: Remove.
+ <objfiles_list>: New member.
+ <objfiles_range, objfiles_safe_range>: Change type.
+ (objfiles): Change return type.
+ (objfiles_safe): Update.
+ (multi_objfile_p): Rewrite and inline.
+ (object_files): Remove macro.
+