Add new feature gate to standard library

Author: ecstatic-morse

library/core/src/lib.rs

@@ -82,6 +82,7 @@
 #![feature(const_pin)]
 #![feature(const_fn_union)]
 #![feature(const_fn)]
+#![cfg_attr(not(bootstrap), feature(const_fn_floating_point_arithmetic))]
 #![feature(const_generics)]
 #![feature(const_option)]
 #![feature(const_precise_live_drops)]

library/std/src/lib.rs

@@ -236,6 +236,7 @@
 #![feature(clamp)]
 #![feature(concat_idents)]
 #![feature(const_cstr_unchecked)]
+#![cfg_attr(not(bootstrap), feature(const_fn_floating_point_arithmetic))]
 #![feature(const_fn_transmute)]
 #![feature(const_fn)]
 #![feature(const_ip)]