[llvm] [LoopDist] Add some runtime checks for cross partition loads (PR #145623)

[Michael Kruse via llvm-commits]

================
@@ -504,6 +504,12 @@ class InstPartitionContainer {
       Value *Ptr = RtPtrCheck->Pointers[I].PointerValue;
       auto Instructions =
           LAI.getInstructionsForAccess(Ptr, RtPtrCheck->Pointers[I].IsWritePtr);
+      const MemoryDepChecker &DC = LAI.getDepChecker();
+      bool IsWritePtr = !RtPtrCheck->Pointers[I].IsWritePtr;
+      if (!DC.getOrderForAccess(Ptr, IsWritePtr).empty()) {
+        auto AltInstructions = LAI.getInstructionsForAccess(Ptr, IsWritePtr);
+        Instructions.append(AltInstructions.begin(), AltInstructions.end());
+      }
----------------
Meinersbur wrote:

```suggestion
      auto Instructions = LAI.getInstructionsForAccess(Ptr, true);
      auto ReadInstructions = LAI.getInstructionsForAccess(Ptr, false);
      Instructions.append(ReadInstructions.begin(), ReadInstructions.end());
```
`getOrderForAccess().empty()` just returns whether `getInstructionsForAccess` will be empty. If that is the case, there isn't any additional overhead of calling `getInstructionsForAccess` directly.

https://github.com/llvm/llvm-project/pull/145623