Arbitrary self types v2: stabilize test changes

All the test changes necessary for stabilization here.

Author: adetaylor

tests/auxiliary/minicore.rs

@@ -31,11 +31,6 @@ macro_rules! impl_marker_trait {
 #[lang = "sized"]
 pub trait Sized {}
 
-#[lang = "legacy_receiver"]
-pub trait LegacyReceiver {}
-impl<T: ?Sized> LegacyReceiver for &T {}
-impl<T: ?Sized> LegacyReceiver for &mut T {}
-
 #[lang = "copy"]
 pub trait Copy: Sized {}
 

tests/codegen/avr/avr-func-addrspace.rs

@@ -9,7 +9,7 @@
 // It also validates that functions can be called through function pointers
 // through traits.
 
-#![feature(no_core, lang_items, intrinsics, unboxed_closures, arbitrary_self_types)]
+#![feature(no_core, lang_items, intrinsics, unboxed_closures)]
 #![crate_type = "lib"]
 #![no_core]
 
@@ -18,8 +18,6 @@ pub trait Sized {}
 #[lang = "copy"]
 pub trait Copy {}
 impl<T: ?Sized> Copy for *const T {}
-#[lang = "legacy_receiver"]
-pub trait LegacyReceiver {}
 #[lang = "tuple_trait"]
 pub trait Tuple {}