Stabilize asm! and global_asm!

Amanieu · Amanieu · commit eec5f919e78d · 2021-12-12T11:20:03.000Z
They are also removed from the prelude as per the decision in rust-lang/rust#87228. stdarch and compiler-builtins are updated to work with the new, stable asm! and global_asm! macros.
diff --git a/tests/run/asm.rs b/tests/run/asm.rs
@@ -3,8 +3,6 @@
 // Run-time:
 //   status: 0
 
-#![feature(asm, global_asm)]
-
 global_asm!("
     .global add_asm
 add_asm:
