[PATCH] D17460: Add prefix based function layout when profile is available.

[Dehao Chen via llvm-commits]

danielcdh added a comment.

added the unittest. also removed hasProfile to use getEntryCount()'s boolean value to check. I will have a follow-up patch to make getEntryCount() behavior consistent between sample profile and instr profile.


http://reviews.llvm.org/D17460