[llvm] [BOLT] Support profile density with basic samples (PR #137644)

[Maksim Panchenko via llvm-commits]

https://github.com/maksfb approved this pull request.

Looks good.

Bike-shedding kind of comment: members that used to have "branch" in the name now use "sample" which means "sample or branch", which makes "sample" ambiguous. If you use a different term, it will be less confusing. E.g. "hits" or "events".

https://github.com/llvm/llvm-project/pull/137644