Stabilize mem::take (mem_take)

Tracking issue: https://github.com/rust-lang/rust/issues/61129

src/librustc_codegen_llvm/lib.rs

@@ -19,7 +19,6 @@
 #![feature(link_args)]
 #![feature(static_nobundle)]
 #![feature(trusted_len)]
-#![feature(mem_take)]
 
 use back::write::{create_target_machine, create_informational_target_machine};
 use syntax_pos::symbol::Symbol;