gdb: add breakpoint::locations method

Add the breakpoint::locations method, which returns a range that can be
used to iterate over a breakpoint's locations.  This shortens

  for (bp_location *loc = b->loc; loc != nullptr; loc = loc->next)

into

  for (bp_location *loc : b->locations ())

Change all the places that I found that could use it.

gdb/ChangeLog:

	* breakpoint.h (bp_locations_range): New.
	(struct breakpoint) <locations>: New.  Use where possible.

Change-Id: I1ba2f7d93d57e544e1f8609124587dcf2e1da037

1 files changed, 7 insertions, 0 deletions

diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 5a10839..f31498a 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -703,6 +703,10 @@ enum watchpoint_triggered
 
 extern bool target_exact_watchpoints;
 
+/* bp_location linked list range.  */
+
+using bp_locations_range = next_adapter<bp_location>;
+
 /* Note that the ->silent field is not currently used by any commands
    (though the code is in there if it was to be, and set_raw_breakpoint
    does set it to 0).  I implemented it because I thought it would be
@@ -715,6 +719,9 @@ struct breakpoint
 {
   virtual ~breakpoint ();
 
+  /* Return a range of this breakpoint's locations.  */
+  bp_locations_range locations ();
+
   /* Methods associated with this breakpoint.  */
   const breakpoint_ops *ops = NULL;