[llvm] [TRI] Remove reserved registers in getRegPressureSetLimit (PR #118787)

[Nikita Popov via llvm-commits]

nikic wrote:

The compile-time impact of this change is indeed huge: https://llvm-compile-time-tracker.com/compare.php?from=e0ea9fd6dc36f585e364d4e569095ebe063e2573&to=43357b1b97d0a61a48c3a47dd119ec2da09c40a3&stat=instructions:u

https://github.com/llvm/llvm-project/pull/118787