parse_crate_from_source_str takes a parse_sess, not codemap

This was causing problems when reading from stdin for subsequent passes that
needed to generate node ids.

src/comp/driver/rustc.rs

@@ -106,7 +106,7 @@ fn parse_input_src(sess: session::session, cfg: &ast::crate_cfg,
     }.read_whole_stream();
     let src = str::unsafe_from_bytes_ivec(srcbytes);
     let crate = parser::parse_crate_from_source_str(infile, src, cfg,
-                                                    sess.get_codemap());
+                                                    sess.get_parse_sess());
     ret {crate: crate, src: src};
 }