FROMPULL: arch: arm: cortex_m: add memory to the clobber list

Add "memory" to the clobber list"

From GCC 14 the compiler optimizes away memory accesses that do not
impact the asm block. Adding the memory to the clobber list lets the
compiler know that the memory state is to be preserved.

zephyrproject-rtos/zephyr#80579

BUG=b:376282914

Change-Id: I990e2256d0019361b3ef1f736095ebca3806a6e1
Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5976801
Commit-Queue: Jeremy Bettis <jbettis@chromium.org>
Tested-by: Jeremy Bettis <jbettis@chromium.org>

arch/arm/core/cortex_m/thread.c

@@ -588,7 +588,7 @@ void arch_switch_to_main_thread(struct k_thread *main_thread, char *stack_ptr,
 	"bx    r4\n"		/* We don’t intend to return, so there is no need to link. */
 	:
 	: "r" (_main), "r" (stack_ptr)
-	: "r0", "r1", "r2", "r3", "r4", "ip", "lr");
+	: "r0", "r1", "r2", "r3", "r4", "ip", "lr", "memory");
 
 	CODE_UNREACHABLE;
 }