[llvm] [MemProf] Optionally save context size info on largest cold allocations (PR #142837)

[Hubert Tong via llvm-commits]

hubert-reinterpretcast wrote:

> I'm not convinced that it won't work, because the stack ids are all internal to the profile-use. I think the tests just might be failing because the stack ids don't match what we have hardcoded.

Thanks. Is there some way to create the big-endian version of the tests that could be used to validate the functionality?

https://github.com/llvm/llvm-project/pull/142837