stabilize const_int_sign

Author: tspiteri

src/libcore/num/mod.rs

@@ -2203,7 +2203,8 @@ assert_eq!((-10", stringify!($SelfT), ").signum(), -1);",
 $EndFeature, "
 ```"),
             #[stable(feature = "rust1", since = "1.0.0")]
-            #[rustc_const_unstable(feature = "const_int_sign", issue = "53718")]
+            #[rustc_const_stable(feature = "const_int_sign", since = "1.46.0")]
+            #[cfg_attr(bootstrap, allow_internal_unstable(const_if_match))]
             #[inline]
             pub const fn signum(self) -> Self {
                 match self {

src/test/ui/consts/const-int-sign-rpass.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(const_int_sign)]
-
 const NEGATIVE_A: bool = (-10i32).is_negative();
 const NEGATIVE_B: bool = 10i32.is_negative();
 const POSITIVE_A: bool = (-10i32).is_positive();