Reuse breakpoints more frequently in DAP

The DAP breakpoint code tries to reuse a breakpoint when possible.
Currently it uses the condition and the hit condition (aka ignore
count) when making this determination.  However, these attributes are
just going to be reset anyway, so this patch changes the code to
exclude these from the reuse decision.

gdb/python/lib/gdb/dap/breakpoint.py

@@ -85,9 +85,11 @@ def _set_breakpoints_callback(kind, specs, creator):
     breakpoint_map[kind] = {}
     result = []
     for spec in specs:
-        keyspec = frozenset(spec.items())
-
+        # It makes sense to reuse a breakpoint even if the condition
+        # or ignore count differs, so remove these entries from the
+        # spec first.
         (condition, hit_condition) = _remove_entries(spec, "condition", "hitCondition")
+        keyspec = frozenset(spec.items())
 
         if keyspec in saved_map:
             bp = saved_map.pop(keyspec)