q_uninitialized_relocate: use memcpy, not memmove

The [first, first+n) and [out, out+n) ranges cannot possibly overlap, as
by definition the former contains live objects while the latter points
into uninitialized storage. So we can use memcpy here, and not memmove.

Change-Id: I4a1b39f73ffa67915c5252938554f45f4444293e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qcontainertools_impl.h

@@ -72,10 +72,10 @@ template <typename T, typename N>
 void q_uninitialized_relocate_n(T* first, N n, T* out)
 {
     if constexpr (QTypeInfo<T>::isRelocatable) {
-        if (n != N(0)) { // even if N == 0, out == nullptr or first == nullptr are UB for memmove()
-            std::memmove(static_cast<void*>(out),
-                         static_cast<const void*>(first),
-                         n * sizeof(T));
+        if (n != N(0)) { // even if N == 0, out == nullptr or first == nullptr are UB for memcpy()
+            std::memcpy(static_cast<void *>(out),
+                        static_cast<const void *>(first),
+                        n * sizeof(T));
         }
     } else {
         q_uninitialized_move_if_noexcept_n(first, n, out);