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

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Do you have the original unreduced IR file? I am going to try to reduce a UB-free testcase.

Not one I can just post here given this comes from our internal build system..

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