Rollup merge of rust-lang#142065 - paolobarbolini:stabilize-const_eq_ignore_ascii_case, r=Mark-Simulacrum

Stabilize `const_eq_ignore_ascii_case`

Tracking issue: rust-lang#131719
Closes rust-lang#131719
FCP Completed: rust-lang#131719 (comment)

Author: GuillaumeGomez

core/src/slice/ascii.rs

@@ -52,7 +52,7 @@ impl [u8] {
     /// Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`,
     /// but without allocating and copying temporaries.
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_unstable(feature = "const_eq_ignore_ascii_case", issue = "131719")]
+    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn eq_ignore_ascii_case(&self, other: &[u8]) -> bool {

core/src/str/mod.rs

@@ -2671,7 +2671,7 @@ impl str {
     /// assert!(!"Ferrös".eq_ignore_ascii_case("FERRÖS"));
     /// ```
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_unstable(feature = "const_eq_ignore_ascii_case", issue = "131719")]
+    #[rustc_const_stable(feature = "const_eq_ignore_ascii_case", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn eq_ignore_ascii_case(&self, other: &str) -> bool {