[llvm] [Inliner] Add option (default off) to inline all calls regardless of the cost (PR #152365)

[Artem Belevich via llvm-commits]

https://github.com/Artem-B approved this pull request.

LGTM.

@arsenm @yxsamliu I vaguely recall that AMDGPU builds sometimes wanted to inline everything. Perhaps this could be a useful knob which could be used for that purpose while leaving normal inlining heuristics in place for the rest of the builds.

https://github.com/llvm/llvm-project/pull/152365