[llvm] [LAA] Prepare to handle diff type sizes (NFC) (PR #122318)

[Florian Hahn via llvm-commits]

================
@@ -2194,13 +2210,8 @@ MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
   // Negative distances are not plausible dependencies.
   if (SE.isKnownNonPositive(Dist)) {
     if (SE.isKnownNonNegative(Dist)) {
-      if (HasSameSize) {
-        // Write to the same location with the same size.
-        return Dependence::Forward;
-      }
-      LLVM_DEBUG(dbgs() << "LAA: possibly zero dependence difference but "
-                           "different type sizes\n");
-      return Dependence::Unknown;
+      // Write to the same location with the same size.
+      return Dependence::Forward;
----------------
fhahn wrote:

```suggestion
       assert(HasSameSize && "accesses must have the same size");
      return Dependence::Forward;
```

https://github.com/llvm/llvm-project/pull/122318