[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:

Are you sure its ok to put this in stage 1? We already do IR replacement for loads and stores in this stage just want to be cautions about adding the same instruction twice to `ToRemove`.

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