[llvm] [Attributor] Teach HeapToStack about conservative GC allocators (PR #113299)

[via llvm-commits]

aykevl wrote:

> For your own purpose, you can disable/filter out H2S AA explicitly when you construct the attributor.

What do you mean by that? Are you referring to the other idea of using the `nofree` parameter attribute on the return value of the allocator?

https://github.com/llvm/llvm-project/pull/113299