[libc++][P0174] Deprecated/removed parts of default allocator.

Differential Revision: https://reviews.llvm.org/D70117

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 5b1e5b4338d173e0f290f1b3b245194257ec8d4c
32 files changed