[clang] [llvm] CodeGen: Add LibcallLoweringInfo analysis pass (PR #168622)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> > Created a revert patch. This patch causes massive perf regressions, which cannot be easily fixed
> 
> Same here, many Fortran benchmarks degraded. Thanks for addressing it.

I hope it should be fixed already, please check

https://github.com/llvm/llvm-project/pull/168622