Reexport syntax_pos in codemap and fix some cfail tests

src/libsyntax/codemap.rs

@@ -26,7 +26,7 @@ use std::rc::Rc;
 use std::env;
 use std::fs;
 use std::io::{self, Read};
-use syntax_pos::*;
+pub use syntax_pos::*;
 use errors::CodeMapper;
 
 use ast::Name;