Fix a bug with region-parameterized enums etc where trans considered

them to be non-monomorphic.  Merely having lifetime parameters
is not enough to qualify for that status.  Fixes #5243.

src/test/run-pass/issue-5243.rs

@@ -0,0 +1,23 @@
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Check that merely have lifetime parameters is not
+// enough for trans to consider this as non-monomorphic,
+// which led to various assertions and failures in turn.
+
+struct S<'self> {
+    v: &'self int
+}
+
+fn f<'lt>(_s: &S<'lt>) {}
+
+fn main() {
+    f(& S { v: &42 });
+}