[llvm] Extend memprof matching to support __size_returning_new variants. (PR #105473)

[Teresa Johnson via llvm-commits]

https://github.com/teresajohnson commented:

I'm having trouble seeing where the changes to support the size returning new variants is - I just see a lot of restructuring to enable the unit testing and mocking.

https://github.com/llvm/llvm-project/pull/105473