[llvm] [InlineCost] Enable the cost benefit analysis for Sample PGO (PR #66457)

[Haohai Wen via llvm-commits]

HaohaiWen wrote:

We've seen improvement for our internal workloads.
This patch just let InlineCost use profile data. I don't think its the root cause of regression.

https://github.com/llvm/llvm-project/pull/66457