Remove unnecessary features from rustc_abi

Author: Veykril

compiler/rustc_abi/src/lib.rs

@@ -1,21 +1,22 @@
-#![cfg_attr(feature = "nightly", feature(step_trait, rustc_attrs, min_specialization))]
+#![cfg_attr(feature = "nightly", feature(step_trait))]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 
 use std::fmt;
-#[cfg(feature = "nightly")]
-use std::iter::Step;
 use std::num::{NonZeroUsize, ParseIntError};
 use std::ops::{Add, AddAssign, Mul, RangeInclusive, Sub};
 use std::str::FromStr;
 
 use bitflags::bitflags;
+use rustc_index::{Idx, IndexSlice, IndexVec};
+
 #[cfg(feature = "nightly")]
 use rustc_data_structures::stable_hasher::StableOrd;
-use rustc_index::{Idx, IndexSlice, IndexVec};
 #[cfg(feature = "nightly")]
 use rustc_macros::HashStable_Generic;
 #[cfg(feature = "nightly")]
 use rustc_macros::{Decodable, Encodable};
+#[cfg(feature = "nightly")]
+use std::iter::Step;
 
 mod layout;