[llvm] LAA: refactor dependence class to prep for scaled strides (NFC) (PR #122113)

[Florian Hahn via llvm-commits]

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@@ -365,17 +365,25 @@ class MemoryDepChecker {
   void mergeInStatus(VectorizationSafetyStatus S);
 
   struct DepDistanceStrideAndSizeInfo {
+    // Strides could either be scaled (in bytes, taking the size of the
+    // underlying type into account), or unscaled (in indexing units; unscaled
+    // stride = scaled stride / size of underlying type). Here, strides are
+    // unscaled.
     const SCEV *Dist;
-    uint64_t StrideA;
-    uint64_t StrideB;
+    uint64_t MaxStride;
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fhahn wrote:

nit: move to `MaxStride`?

```suggestion
    /// Strides could either be scaled (in bytes, taking the size of the
     // underlying type into account), or unscaled (in indexing units; unscaled
     /// stride = scaled stride / size of underlying type). Here, strides are
     /// unscaled.
    uint64_t MaxStride;
```

https://github.com/llvm/llvm-project/pull/122113