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

[Shilei Tian via llvm-commits]

shiltian 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?

Nvm. I misunderstood your description.

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