Merge pull request #19947 from jketema/function-confusion

C++: Move builtin function identification to its own table

Author: jketema

cpp/downgrades/801b2f03360d78c85f51fbad9b75956fa8d58b00/functions.ql

@@ -0,0 +1,9 @@
+class Function extends @function {
+  string toString() { none() }
+}
+
+from Function f, string n, int k, int new_k
+where
+  functions(f, n, k) and
+  if builtin_functions(f) then new_k = 6 else new_k = k
+select f, n, new_k