Revert "[libc++] Granularize the rest of memory"

Breaks buildbots.

This reverts commit 30adaa730c4768b5eb06719c808b2884fcf53cf3.

NOKEYCHECK=True
GitOrigin-RevId: bc8fd9c6335f37edb3a56a628f38c0bbf96367ad
diff --git a/include/regex b/include/regex
index 6fcc638..3899892 100644
--- a/include/regex
+++ b/include/regex
@@ -772,6 +772,7 @@
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <deque>
+#include <memory>
 #include <stdexcept>
 #include <string>
 #include <vector>