libcpp: Avoid unnecessary ad-hoc uses for large source files

libcpp/ChangeLog:
	* line-map.c (get_combined_adhoc_loc): Remove condition
	on locus < RESERVED_LOCATION_COUNT when considering
	whether a caret == start == finish location can be
	simply stored as the caret location.

From-SVN: r231918

libcpp/ChangeLog

+2015-12-22  David Malcolm  <dmalcolm@redhat.com>
+
+	* line-map.c (get_combined_adhoc_loc): Remove condition
+	on locus < RESERVED_LOCATION_COUNT when considering
+	whether a caret == start == finish location can be
+	simply stored as the caret location.
+
 2015-12-07  David Malcolm  <dmalcolm@redhat.com>
 
 	* include/line-map.h (rich_location::set_range): Add line_maps *

libcpp/line-map.c

@@ -196,10 +196,9 @@ get_combined_adhoc_loc (struct line_maps *set,
 	}
     }
 
-  /* We can also compactly store the reserved locations
+  /* We can also compactly store locations
      when locus == start == finish (and data is NULL).  */
-  if (locus < RESERVED_LOCATION_COUNT
-      && locus == src_range.m_start
+  if (locus == src_range.m_start
       && locus == src_range.m_finish
       && !data)
     return locus;