Fix codegen test by removing T:Trait bound

Author: tiif

tests/ui/internal/auxiliary/unstable_impl_codegen_aux2.rs

@@ -8,7 +8,7 @@ use aux::Trait;
 /// that depends on aux crate in
 /// unstable_impl_codegen_aux1.rs
 
-pub fn foo<T: Trait>(a:T) {
+pub fn foo<T>(a:T) {
     a.method();
 }
 

tests/ui/internal/unstable_impl_codegen.rs

@@ -1,6 +1,5 @@
 //@ aux-build:unstable_impl_codegen_aux2.rs
 //@ check-pass
-#![feature(foo)]
 
 /// Downstream crate for unstable impl codegen test
 /// that depends on upstream crate in