[QoI] Add a fixed crasher which triggers closure return diagnostics related to rdar://problem/33067102

Author: xedin

validation-test/compiler_crashers_2_fixed/0113-rdar33067102-2.swift

@@ -0,0 +1,5 @@
+// RUN: not %target-swift-frontend -swift-version 4 %s -typecheck
+
+func flatterMap(_ records: [((Int))]) -> [Int] {
+  records.flatMap { _ in return 1 } // expected-note {{}}
+}