[clang] Performance optimizations for function effects (nonblocking attribute etc.) (PR #96844)

[Timm Baeder via cfe-commits]

tbaederr wrote:

I guess you meant to link to https://llvm-compile-time-tracker.com/compare.php?from=f03cb005eb4ba3c6fb645aca2228e907db8cd452&to=038b39d3235c6c8151127c34d34f498dd298273c&stat=instructions:u directly?

https://github.com/llvm/llvm-project/pull/96844