[llvm] [AllocToken] Introduce AllocToken instrumentation pass (PR #156838)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka commented:

Wouldn't be better to land attribute part a separate PR?
Attributes are part of the language, and transformation is just one of possible users.

Also it's a lot of simple change in multiple files.


https://github.com/llvm/llvm-project/pull/156838