[clang] [clang-tools-extra] [libcxx] [clang] Enable sized deallocation by default in C++14 onwards (PR #83774)

[Fangrui Song via cfe-commits]

https://github.com/MaskRay requested changes to this pull request.

This needs sign-off from Apple reviewers whether the version table in Darwin.cpp is correct.

https://github.com/llvm/llvm-project/pull/83774