[llvm] Reapply "[DFAJumpThreading] Enable DFAJumpThread by default." (PR #169183)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

I think that's just how llvm-reduce does things. `quux` is the function that contains the bad transformation (not sure how things look after inlining).

https://github.com/llvm/llvm-project/pull/169183