[llvm] [InlineCost] Disable cost-benefit when sample based PGO is used (PR #86626)

[Wei Xiao via llvm-commits]

williamweixiao wrote:

> The profile quality could be one of reasons. In addition, cost-benefit subtracts ColdSize based on the assumption that machine function splitting could handle the cold code later. MFS may need fine tuning for sample based pgo.
I'm a little confused. The MFS issue is specific for sample PGO? The instrumentation PGO doesn't need the MFS tuning?



https://github.com/llvm/llvm-project/pull/86626