[llvm] [Passes][Inliner] Handle optsize/minsize via attributes only (PR #190168)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> InlineParams already has separate threshold for OptSize/MinSize functions that get applied based on the corresponding function attributes. As such, we should not also be changing the DefaultThreshold based on the pipeline Os/Oz levels as well.

If I pass `-Os` to the compiler, will it apply those function attributes to all functions?

https://github.com/llvm/llvm-project/pull/190168