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, 1 deletions

diff --git a/gdb/defs.h b/gdb/defs.h
index 32b08bb..a555da1 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -649,7 +649,6 @@ extern void (*deprecated_readline_begin_hook) (char *, ...)
      ATTRIBUTE_FPTR_PRINTF_1;
 extern char *(*deprecated_readline_hook) (const char *);
 extern void (*deprecated_readline_end_hook) (void);
-extern void (*deprecated_register_changed_hook) (int regno);
 extern void (*deprecated_context_hook) (int);
 extern ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
 					      struct target_waitstatus *status,