Rollup merge of #148757 - nxsaken:const_mem_take, r=scottmcm

Constify `mem::take`

Feature: `const_default` (rust-lang/rust#143894)

library/core/src/mem/mod.rs

@@ -808,7 +808,8 @@ pub const fn swap<T>(x: &mut T, y: &mut T) {
 /// ```
 #[inline]
 #[stable(feature = "mem_take", since = "1.40.0")]
-pub fn take<T: Default>(dest: &mut T) -> T {
+#[rustc_const_unstable(feature = "const_default", issue = "143894")]
+pub const fn take<T: [const] Default>(dest: &mut T) -> T {
     replace(dest, T::default())
 }