[clang] [clang-tools-extra] [libcxx] Reland "[clang] Enable sized deallocation by default in C++14 onwards" (PR #90373)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> Based on my rough understanding, this is expected?

What do you mean?

Isn't this test needs to be updated or disabled?

https://github.com/llvm/llvm-project/pull/90373