[llvm] [MemProf] Print full context hash when reporting hinted bytes (PR #114465)

[Snehasish Kumar via llvm-commits]

snehasish wrote:

> Is it worth it? We reuse this vector multiple times for other records. And the lifetime is not so long that it is going to make any noticeable difference on memory (this is in the pre-lto link compile).

Probably not if it is reused. Ok to leave as is.

https://github.com/llvm/llvm-project/pull/114465