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

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

> > There is a Windows failure that I can't reproduce: https://buildkite.com/llvm-project/github-pull-requests/builds/46331 Can someone help me to figure out what is wrong?
> 
> I'm not certain what's going on yet, but it smells a bit like the interpreter needs to know about sized deallocations now being on by default (this may be exposing an existing bug rather than introducing a new one).
> 
> CC @vgvassilev

I am shooting in the dark here, too. Can you forward declare the new operator delete here:
https://github.com/llvm/llvm-project/blob/e2e3624fae669f85de1445bf7037ff29feb30905/clang/lib/Interpreter/Interpreter.cpp#L262

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