[llvm] [AMDGPU] Increase inline threshold when the callee only has one live use (PR #111311)

[Shilei Tian via llvm-commits]

shiltian wrote:

> I'm a bit confused here. This already exists in the form of a cost bonus in the generic inlining cost model.
> 
> Is the point here that you want to effectively double the bonus by both applying it as a bonus in the generic model and as a threshold adjustment in AMDGPU TTI?

Yes. IIUC, the generic model doesn't seem to have a target dependent approach to adjust the bonus. The default value is not sufficient and we want to inline it regardless.

https://github.com/llvm/llvm-project/pull/111311