str: make as_mut_ptr and as_bytes_mut unstably const

Author: RalfJung

library/core/src/str/mod.rs

@@ -338,9 +338,10 @@ impl str {
     /// assert_eq!("🍔∈🌏", s);
     /// ```
     #[stable(feature = "str_mut_extras", since = "1.20.0")]
+    #[rustc_const_unstable(feature = "const_str_as_mut", issue = "130086")]
     #[must_use]
     #[inline(always)]
-    pub unsafe fn as_bytes_mut(&mut self) -> &mut [u8] {
+    pub const unsafe fn as_bytes_mut(&mut self) -> &mut [u8] {
         // SAFETY: the cast from `&str` to `&[u8]` is safe since `str`
         // has the same layout as `&[u8]` (only std can make this guarantee).
         // The pointer dereference is safe since it comes from a mutable reference which
@@ -383,10 +384,11 @@ impl str {
     /// It is your responsibility to make sure that the string slice only gets
     /// modified in a way that it remains valid UTF-8.
     #[stable(feature = "str_as_mut_ptr", since = "1.36.0")]
+    #[rustc_const_unstable(feature = "const_str_as_mut", issue = "130086")]
     #[rustc_never_returns_null_ptr]
     #[must_use]
     #[inline(always)]
-    pub fn as_mut_ptr(&mut self) -> *mut u8 {
+    pub const fn as_mut_ptr(&mut self) -> *mut u8 {
         self as *mut str as *mut u8
     }