[llvm] [IR] Use alloc markers for operator delete variants (PR #138261)

[Marc Auberer via llvm-commits]

marcauberer wrote:

Heads up: Our malfunction tests revealed another problem with this:
(Some of the) child classes implement a custom `operator new` and `operator delete`, which in turn call their respective counterparts in `User`. Until now, in those child classes `operator new(Size)` delegates to `User::operator new(Size, AllocMarker)`, but `operator delete(void*)` delegates to `User::operator delete(void*)`, which is a mismatch and does not work in the scenario, where the constructor throws.
I will investigate further, but this blocks the merge for now.

https://github.com/llvm/llvm-project/pull/138261