Auto merge of #148587 - RalfJung:duration_from_nanos_u128, r=Mark-Simulacrum,oli-obk

stabilize duration_from_nanos_u128

libs-api FCP passed in rust-lang/rust#139201.
Closes rust-lang/rust#139201.

`@oli-obk` would you prefer if we did a const-hack to avoid allowing `const_trait_impl` here?

Author: bors

src/lib.rs

@@ -17,7 +17,7 @@
 #![feature(derive_coerce_pointee)]
 #![feature(arbitrary_self_types)]
 #![feature(iter_advance_by)]
-#![feature(duration_from_nanos_u128)]
+#![cfg_attr(bootstrap, feature(duration_from_nanos_u128))]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,