Constify breakpoint_ops

Now that all breakpoint_ops are statically initialized, they can all
be made const.



diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index b6541b5..c356888 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -243,21 +243,21 @@ static void tracepoint_probe_create_sals_from_location
       struct linespec_result *canonical,
       enum bptype type_wanted);
 
-struct breakpoint_ops base_breakpoint_ops =
+const struct breakpoint_ops base_breakpoint_ops =
 {
   create_sals_from_location_default,
   create_breakpoints_sal_default,
 };
 
 /* Breakpoints set on probes.  */
-static struct breakpoint_ops bkpt_probe_breakpoint_ops =
+static const struct breakpoint_ops bkpt_probe_breakpoint_ops =
 {
   bkpt_probe_create_sals_from_location,
   create_breakpoints_sal_default,
 };
 
 /* Tracepoints set on probes.  */
-static struct breakpoint_ops tracepoint_probe_breakpoint_ops =
+static const struct breakpoint_ops tracepoint_probe_breakpoint_ops =
 {
   tracepoint_probe_create_sals_from_location,
   create_breakpoints_sal_default,
@@ -13735,7 +13735,7 @@ ftrace_command (const char *arg, int from_tty)
 static void
 strace_command (const char *arg, int from_tty)
 {
-  struct breakpoint_ops *ops;
+  const struct breakpoint_ops *ops;
   event_location_up location;
   enum bptype type;
 
diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 2d4a89f..94ae706 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -1398,7 +1398,7 @@ extern void awatch_command_wrapper (const char *, int, bool);
 extern void rwatch_command_wrapper (const char *, int, bool);
 extern void tbreak_command (const char *, int);
 
-extern struct breakpoint_ops base_breakpoint_ops;
+extern const struct breakpoint_ops base_breakpoint_ops;
 
 /* Arguments to pass as context to some catch command handlers.  */
 #define CATCH_PERMANENT ((void *) (uintptr_t) 0)