NotDistinctIdentifier: Performance optimization

Hint optimizer to perform join of exclusions after determining
results.

Author: lcartey

cpp/common/src/codingstandards/cpp/rules/notdistinctidentifier/NotDistinctIdentifier.qll

@@ -12,6 +12,16 @@ abstract class NotDistinctIdentifierSharedQuery extends Query { }
 
 Query getQuery() { result instanceof NotDistinctIdentifierSharedQuery }
 
+bindingset[d, d2]
+pragma[inline_late]
+private predicate after(ExternalIdentifiers d, ExternalIdentifiers d2) {
+  exists(int dStartLine, int d2StartLine |
+    d.getLocation().hasLocationInfo(_, dStartLine, _, _, _) and
+    d2.getLocation().hasLocationInfo(_, d2StartLine, _, _, _) and
+    dStartLine >= d2StartLine
+  )
+}
+
 query predicate problems(
   ExternalIdentifiers d, string message, ExternalIdentifiers d2, string nameplaceholder
 ) {
@@ -20,10 +30,10 @@ query predicate problems(
   d.getName().length() >= 31 and
   d2.getName().length() >= 31 and
   not d = d2 and
-  d.getLocation().getStartLine() >= d2.getLocation().getStartLine() and
   d.getSignificantName() = d2.getSignificantName() and
   not d.getName() = d2.getName() and
   nameplaceholder = d2.getName() and
+  after(d, d2) and
   message =
     "External identifer " + d.getName() +
       " is nondistinct in characters at or over 31 limit, compared to $@"