[llvm] Reland "Redesign Straight-Line Strength Reduction (SLSR) (#162930)" (PR #169614)

[Artem Belevich via llvm-commits]

Artem-B wrote:

> Would it be possible for you to re-stack you changes in a way that the original reverted patch is the starting point

Hmm. looks like you already did. It's just graphite appears to hide the base, but github shows it:

![image.png](https://app.graphite.com/user-attachments/assets/346d3a46-b6ba-405d-a80f-8bcad8045bfc.png)

![image.png](https://app.graphite.com/user-attachments/assets/c235bae7-7eff-4092-b609-4b291c71d2b3.png)



https://github.com/llvm/llvm-project/pull/169614