[llvm] [DFAJumpThreading] Enable the pass by default (PR #83033)

[Nikita Popov via llvm-commits]

nikic wrote:

@UsmanNadeem Given what the pass does, you should aim for 0.1% first-order impact. (IIRC the cost of the original implementation was in that ballpark.)

https://github.com/llvm/llvm-project/pull/83033