Update tests/codegen-units/

Author: mu001999

tests/codegen-units/item-collection/instantiation-through-vtable.rs

@@ -4,6 +4,8 @@
 #![deny(dead_code)]
 #![feature(start)]
 
+#![allow(dead_code)]
+
 trait Trait {
     fn foo(&self) -> u32;
     fn bar(&self);

tests/codegen-units/item-collection/trait-method-default-impl.rs

@@ -3,6 +3,7 @@
 #![deny(dead_code)]
 #![feature(start)]
 
+#[allow(dead_code)]
 trait SomeTrait {
     fn foo(&self) { }
     fn bar<T>(&self, x: T) -> T { x }
@@ -16,6 +17,7 @@ impl SomeTrait for i8 {
     //~ MONO_ITEM fn <i8 as SomeTrait>::foo
 }
 
+#[allow(dead_code)]
 trait SomeGenericTrait<T1> {
     fn foo(&self) { }
     fn bar<T2>(&self, x: T1, y: T2) {}

tests/codegen-units/item-collection/unsizing.rs

@@ -10,6 +10,7 @@
 use std::marker::Unsize;
 use std::ops::CoerceUnsized;
 
+#[allow(dead_code)]
 trait Trait {
     fn foo(&self);
 }