[llvm] [InstCombine] simplify `(X * C0) / (X * C1)` into `C0 / C1`. (PR #73204)

[Yingwei Zheng via llvm-commits]

================
@@ -1207,6 +1207,48 @@ Instruction *InstCombinerImpl::commonIDivTransforms(BinaryOperator &I) {
     }
   }
 
+  // (X * Y) / (X * Z) --> Y / X (and commuted variants)
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dtcxzyw wrote:

```suggestion
  // (X * Y) / (X * Z) --> Y / Z (and commuted variants)
```

https://github.com/llvm/llvm-project/pull/73204