[llvm] [DirectX] Add a GEP to loads and stores on array allocas (PR #148059)

[Farzon Lotfi via llvm-commits]

================
@@ -605,6 +649,7 @@ class DXILLegalizationPipeline {
     LegalizationPipeline[Stage1].push_back(legalizeMemCpy);
     LegalizationPipeline[Stage1].push_back(removeMemSet);
     LegalizationPipeline[Stage1].push_back(updateFnegToFsub);
+    LegalizationPipeline[Stage1].push_back(legalizeLoadStoreOnArrayAllocas);
----------------
farzonl wrote:

To be clear I think if you have a load\store with an i8. this could crash because `fixI8UseChain` will also add the load\store to `ToRemove`.

https://github.com/llvm/llvm-project/pull/148059