Auto merge of rust-lang#84556 - RalfJung:const-fn-trait-bound, r=oli-obk

use correct feature flag for impl-block-level trait bounds on const fn

I am not sure what that special hack was needed for, but it doesn't seem needed any more...

This removes the last use of the `const_fn` feature flag -- Cc rust-lang#84510
r? `@oli-obk`

Author: bors

proc_macro/src/lib.rs

@@ -21,7 +21,8 @@
 #![feature(rustc_allow_const_fn_unstable)]
 #![feature(nll)]
 #![feature(staged_api)]
-#![feature(const_fn)]
+#![cfg_attr(bootstrap, feature(const_fn))]
+#![cfg_attr(not(bootstrap), feature(const_fn_trait_bound))]
 #![feature(const_fn_fn_ptr_basics)]
 #![feature(allow_internal_unstable)]
 #![feature(decl_macro)]