Update cranelift and add a test for bitreverse

Fixes rust-lang#168 using bytecodealliance/cranelift#683

Author: bjorn3

Cargo.lock

@@ -348,6 +348,7 @@ pub mod intrinsics {
         pub fn uninit<T>() -> T;
         pub fn ctlz_nonzero<T>(x: T) -> T;
         pub fn needs_drop<T>() -> bool;
+        pub fn bitreverse<T>(x: T) -> T;
     }
 }
 

example/mini_core.rs

@@ -137,6 +137,8 @@ fn main() {
         puts(*world as *const str as *const u8);
         world as Box<SomeTrait>;
 
+        assert_eq!(intrinsics::bitreverse(0b10101000u8), 0b00010101u8);
+
         assert_eq!(intrinsics::size_of_val(hello) as u8, 6);
 
         let chars = &['C', 'h', 'a', 'r', 's'];