[llvm] [DA] add debug log in ExactRDIVtest (PR #189537)

[Ruoyu Qiu via llvm-commits]

cabbaken wrote:

> So it may be better to insert debug outputs for AM, BM and CM after their declarations?

Yes. But the value of `ConstSrcCoeff`(`AM`), `ConstDstCoeff`(`BM`), `ConstDelta`(`CM`) won't be changed, this debug log shows the initial value of `AM`, `BM` and `CM`. It would be redundant if we output twice.

https://github.com/llvm/llvm-project/pull/189537