[llvm] [AMDGPU] Print max-BB inline rejections (PR #208755)

[Shilei Tian via llvm-commits]

shiltian wrote:

> > Developers sometimes need to understand why a function was not inlined.
> 
> That sounds like a job for OptimizationRemarkEmitter?

Though InlineMaxBB is a debug thingy instead of missing a real optimization opportunity.

https://github.com/llvm/llvm-project/pull/208755