Add test to ensure lifetime is not elided in type alias

Author: GuillaumeGomez

src/test/rustdoc/lifetime-name.rs

@@ -0,0 +1,5 @@
+#![crate_name = "foo"]
+
+// @has 'foo/type.Resolutions.html'
+// @has - '//*[@class="rust typedef"]' "pub type Resolutions<'tcx> = &'tcx u8;"
+pub type Resolutions<'tcx> = &'tcx u8;