tui: replace deprecated_register_changed_hook with observer

This is a straightforward replacement of the TUI's use of the
aforementioned hook with the register_changed observer.  Since this was
the only user of the hook, this patch also removes the hook.

gdb/ChangeLog:

	* defs.h (deprecated_register_changed_hook): Remove prototype.
	* interps.c (clear_iterpreter_hooks): Remove reference to
	deprecated_register_changed_hook.
	* top.c (deprecated_register_changed_hook): Remove prototype.
	* valops.c (value_assign): Remove reference to
	deprecated_register_changed_hook.
	* tui/tui-hooks.c (tui_register_changed): Add parameter "frame".
	Add comment documenting the function.
	(tui_register_changed_observer): Define.
	(tui_install_hooks): Remove reference to
	deprecated_register_changed_hook.  Set
	tui_register_changed_observer.
	(tui_remove_hooks): Remove reference to
	deprecated_register_changed_hook.  Unset
	tui_register_changed_observer.

1 files changed, 0 insertions, 5 deletions

diff --git a/gdb/top.c b/gdb/top.c
index 01fddd2..1e30b1c 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -221,11 +221,6 @@ void (*deprecated_detach_hook) (void);
 
 void (*deprecated_interactive_hook) (void);
 
-/* Tell the GUI someone changed the register REGNO.  -1 means
-   that the caller does not know which register changed or
-   that several registers have changed (see value_assign).  */
-void (*deprecated_register_changed_hook) (int regno);
-
 /* Called when going to wait for the target.  Usually allows the GUI
    to run while waiting for target events.  */