[libc++] Granularize the rest of memory

Reviewed By: ldionne, #libc

Spies: vitalybuka, paulkirth, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D132790

NOKEYCHECK=True
GitOrigin-RevId: d5e26775d089d099d02b168de8ea52179b1b1f75
2 files changed