[llvm] [CodeGen] Add MachineRegisterClassInfo analysis pass (PR #120690)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> > @nikic Can you please evaluate the compile-time impact of this PR? Thanks in advance!
> 
> Sure: https://llvm-compile-time-tracker.com/compare.php?from=c39500f88c93f668c68bdafe56bd8d16e8abbec1&to=71cb02cd0071e85e4da9c13bf762b51b3f805e0b&stat=instructions:u It looks like a minor regression for now. Probably adding the preservation will improve things.

I added the preserved set, how about now?

https://github.com/llvm/llvm-project/pull/120690