[clang] [RFC] Initial implementation of P2719 (PR #113510)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

> We have tracked two more issues to this commit. Both only manifest when using Clang header modules, which likely means that AST serialization is somehow incorrect after this patch. I'm reducing one of the test cases now, but it's taking a lot of time. In the meantime, please take a look at the AST serialization in case you can spot any issue there.

A lot of back and forth happened with tracking type awareness but also *destroying* delete, I'm currently wondering if the issue is that deserialization of a destroying delete failing to ensure correct ASTContext state

https://github.com/llvm/llvm-project/pull/113510