Add test case for primitive links in alias js

tests/rustdoc/type-alias/primitive-local-link-121106.rs

@@ -0,0 +1,19 @@
+#![crate_name = "foo"]
+
+#![feature(rustc_attrs)]
+
+// @has foo/primitive.i32.html '//h1' 'Primitive Type i32'
+// @has foo/index.html '//a/@href' '../foo/index.html'
+#[rustc_doc_primitive = "i32"]
+mod i32 {}
+
+// @has foo/struct.Node.html '//a/@href' 'primitive.i32.html'
+pub struct Node;
+
+impl Node {
+    pub fn edge(&self) -> i32 { 0 }
+}
+
+// @!has foo/type.Alias.html '//a/@href' 'primitive.i32.html'
+// @hasraw 'type.impl/foo/struct.Node.js' 'href=\"foo/primitive.i32.html\"'
+pub type Alias = Node;