AK+DynamicLoader: Move optimizer_fence() into AK

This will allow us to use this function in other places.

AK/Fences.h

@@ -20,9 +20,15 @@ static inline void atomic_thread_fence(MemoryOrder order) noexcept
     return __atomic_thread_fence(order);
 }
 
+static inline void optimizer_fence()
+{
+    asm volatile("" ::: "memory");
+}
+
 }
 
 #if USING_AK_GLOBALLY
 using AK::atomic_signal_fence;
 using AK::atomic_thread_fence;
+using AK::optimizer_fence;
 #endif

Userland/DynamicLoader/main.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Fences.h>
 #include <AK/LexicalPath.h>
 #include <AK/ScopeGuard.h>
 #include <Kernel/API/POSIX/sys/stat.h>
@@ -147,11 +148,6 @@ NAKED void _start(int, char**, char**)
 #endif
 }
 
-ALWAYS_INLINE static void optimizer_fence()
-{
-    asm("" ::: "memory");
-}
-
 [[gnu::no_stack_protector]] void _entry(int argc, char** argv, char** envp)
 {
     char** env;