Use out instead of lateout for strex in asm! block

The STREX instruction doesn't permits the Rd register to be the
same as Rt and Rn, this applies to Cortex-M7 as well to
Cortex-M4, and probably others too.

Signed-off-by: Jean Pierre Dudey <[email protected]>

Author: jeandudey

src/reg/atomic.rs

@@ -235,7 +235,7 @@ macro_rules! atomic_bits {
                         $strex,
                         input = in(reg) self,
                         address = in(reg) address,
-                        status = lateout(reg) status,
+                        status = out(reg) status,
                         options(nostack, preserves_flags),
                     );
                 }