rustc: Remove all usage of manual deref()

Favor using '*' instead

src/test/compile-fail/issue-7013.rs

@@ -40,7 +40,7 @@ fn main()
     //~^ ERROR cannot pack type `~B`, which does not fulfill `Send`
     let v = Rc::new(RefCell::new(a));
     let w = v.clone();
-    let b = v.deref();
+    let b = &*v;
     let mut b = b.borrow_mut();
     b.v.set(w.clone());
 }

src/test/run-pass/self-re-assign.rs

@@ -20,5 +20,5 @@ pub fn main() {
 
    let mut x = Rc::new(3);
    x = x;
-   assert!(*x.deref() == 3);
+   assert!(*x == 3);
 }