[libc] Fix missing restricts

GitOrigin-RevId: 5ee5acf7d94c9e83dd0917fb5f4bd52a27ae18bd
diff --git a/src/string/memory_utils/elements_x86.h b/src/string/memory_utils/elements_x86.h
index e8be55b..3b45275 100644
--- a/src/string/memory_utils/elements_x86.h
+++ b/src/string/memory_utils/elements_x86.h
@@ -30,7 +30,7 @@
 
 #ifdef __SSE2__
 template <typename Base> struct Vector : public Base {
-  static void Copy(char *dst, const char *src) {
+  static void Copy(char *__restrict dst, const char *__restrict src) {
     Base::Store(dst, Base::Load(src));
   }