[llvm] [DFAJumpThreading] Enable DFAJumpThread by default. (PR #157646)

[Nikita Popov via llvm-commits]

nikic wrote:

This pass currently does not have a [maintainer](https://github.com/llvm/llvm-project/blob/main/llvm/Maintainers.md). We should have one if we enable it by default.

@XChy What is your opinion on the current quality of this pass?

@buggfg Beyond running SPEC, have you performed any due diligence to ensure this pass is ready for default enablement? Have you performed any targeted fuzzing for this enablement?

I'll provide new compile-time numbers.

https://github.com/llvm/llvm-project/pull/157646