Add test for relaxed circularity check from parse-time lookup removal

This didn't work in 5.3:

  error: variable used within its own initial value
  let color = color(with: 123)
              ^

Author: slavapestov

test/NameLookup/name_lookup.swift

@@ -653,3 +653,12 @@ func sr9015() {
   let closure1 = { closure2() } // expected-error {{circular reference}} expected-note {{through reference here}} expected-note {{through reference here}}
   let closure2 = { closure1() } // expected-note {{through reference here}} expected-note {{through reference here}} expected-note {{through reference here}}
 }
+
+func color(with value: Int) -> Int {
+  return value
+}
+
+func useColor() {
+  let color = color(with: 123)
+  _ = color
+}