Fix expected error messages for better printing of ty_ptr

Author: marijnh

src/test/compile-fail/binop-add-ptr.rs

@@ -1,4 +1,4 @@
-// error-pattern:binary operation + cannot be applied to type `*i`
+// error-pattern:binary operation + cannot be applied to type `*int`
 
 fn die() -> *int { (0 as *int) + (0 as *int) }
 fn main() { }

src/test/compile-fail/native-type-mismatch.rs

@@ -1,4 +1,4 @@
-// error-pattern:expected `*Mb` but found `native`
+// error-pattern:expected `*u8` but found `native`
 use std;
 
 fn main() unsafe {