[clang] [llvm] [Pipelines] Move IPSCCP after inliner pipeline (PR #96620)

[Nikita Popov via cfe-commits]

nikic wrote:

Yes, this causes a massive compile-time regression: http://llvm-compile-time-tracker.com/compare.php?from=253a294b54a6096a0b66f840931dd0e345d70c4f&to=20869e8ed55c58696ce4e9dc3d18cd6af01ed49c&stat=instructions:u

https://github.com/llvm/llvm-project/pull/96620