[clang] [llvm] [clang][Inliner] Add opt-in inliner hints and implementation-file functions (PR #228074)

[Kuba Mracek via cfe-commits]

kubamracek wrote:

Based on the discussion on the RFC and here, I'd like to go ahead and merge this PR. Currently, it's only doing anything new under a flag, and that's useful for further evaluations and experiments. @rjmccall @efriedma-quic WDYT?

https://github.com/llvm/llvm-project/pull/228074