effect checking should really be using `expr_ty_adjusted`

[arielb1]

Reproduced on: rustc 1.5.0-nightly (6108e8c3e 2015-09-28)

unsafe fn blow_up() {
    *(0xcccccccc as *mut u8) = 0;
}

fn main() {
    (&blow_up)();
}