[committed] Add test for c++/92451

[Marek Polacek]

This was ICEing from r277865 to r278786.

Tested on x86_64-linux, applying to trunk.

2019-12-06  Marek Polacek  <pola...@redhat.com>

        PR c++/92451
        * g++.dg/overload/error4.C: New test.

--- /dev/null
+++ gcc/testsuite/g++.dg/overload/error4.C
@@ -0,0 +1,6 @@
+// PR c++/92451
+
+template<typename T> struct Local {};
+void f() {
+  Local(int); // { dg-error "" }
+}