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, 1 insertions, 1 deletions

diff --git a/gdb/jit.c b/gdb/jit.c
index be10f19..1de785b 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -783,7 +783,7 @@ jit_breakpoint_deleted (struct breakpoint *b)
   if (b->type != bp_jit_event)
     return;
 
-  for (bp_location *iter = b->loc; iter != nullptr; iter = iter->next)
+  for (bp_location *iter : b->locations ())
     {
       for (objfile *objf : iter->pspace->objfiles ())
 	{