Const-stabilize some arithmetic intrinsics

Author: ecstatic-morse

src/libcore/intrinsics.rs

@@ -1305,9 +1305,11 @@ extern "rust-intrinsic" {
 
     /// Performs an unchecked division, resulting in undefined behavior
     /// where y = 0 or x = `T::min_value()` and y = -1
+    #[rustc_const_unstable(feature = "const_int_unchecked_arith", issue = "none")]
     pub fn unchecked_div<T>(x: T, y: T) -> T;
     /// Returns the remainder of an unchecked division, resulting in
     /// undefined behavior where y = 0 or x = `T::min_value()` and y = -1
+    #[rustc_const_unstable(feature = "const_int_unchecked_arith", issue = "none")]
     pub fn unchecked_rem<T>(x: T, y: T) -> T;
 
     /// Performs an unchecked left shift, resulting in undefined behavior when
@@ -1321,14 +1323,17 @@ extern "rust-intrinsic" {
 
     /// Returns the result of an unchecked addition, resulting in
     /// undefined behavior when `x + y > T::max_value()` or `x + y < T::min_value()`.
+    #[rustc_const_unstable(feature = "const_int_unchecked_arith", issue = "none")]
     pub fn unchecked_add<T>(x: T, y: T) -> T;
 
     /// Returns the result of an unchecked subtraction, resulting in
     /// undefined behavior when `x - y > T::max_value()` or `x - y < T::min_value()`.
+    #[rustc_const_unstable(feature = "const_int_unchecked_arith", issue = "none")]
     pub fn unchecked_sub<T>(x: T, y: T) -> T;
 
     /// Returns the result of an unchecked multiplication, resulting in
     /// undefined behavior when `x * y > T::max_value()` or `x * y < T::min_value()`.
+    #[rustc_const_unstable(feature = "const_int_unchecked_arith", issue = "none")]
     pub fn unchecked_mul<T>(x: T, y: T) -> T;
 
     /// Performs rotate left.

src/libcore/lib.rs

@@ -76,6 +76,7 @@
 #![feature(const_int_euclidean)]
 #![feature(const_int_overflowing)]
 #![feature(const_int_saturating)]
+#![feature(const_int_unchecked_arith)]
 #![feature(const_panic)]
 #![feature(const_fn_union)]
 #![feature(const_generics)]