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

[Hongyu Chen via llvm-commits]

XChy wrote:

@nikic Thanks for your help in pushing this optimization forward! I have opened a meta issue #165984 to track the problems to be solved at its initial stage. I am happy to see the enablement of this pass. @UsmanNadeem, just to double-check, do you think it's prepared to enable DFAJumpThreading at this stage?

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