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

[Hongyu Chen via llvm-commits]

XChy wrote:

I tried to reduce it with https://github.com/dtcxzyw/llvm-ub-aware-interpreter, but it contains immediate UB:
```
UB triggered: load from poison pointer
Exited with immediate UB.
Stacktrace:
    %load = load ptr, ptr poison, align 8 at @hoge.107
    call void @hoge.107() #7 at @pluto
    call void @pluto(ptr noundef nonnull align 8 dereferenceable(24) %alloca1, ptr %load, i64 %load16) at @main
```

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