[llvm] [X86] Enable EliminateSpillageCopies by default on X86 (PR #155868)

[Nikita Popov via llvm-commits]

nikic wrote:

https://llvm-compile-time-tracker.com/compare.php?from=f65f60ee2359e47480c897d4174bc7471d151832&to=5da5e7ec7830aba8f77ba44f8bc418702bbdd9b2&stat=instructions:u

Looks quite expensive for the impact it has.

https://github.com/llvm/llvm-project/pull/155868