adjust AAMetadata

Author: VedantParanjape

llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp

@@ -771,8 +771,12 @@ static Instruction *unpackLoadToAggregate(InstCombinerImpl &IC, LoadInst &LI) {
           ST->getElementType(i), Ptr,
           commonAlignment(Align, SL->getElementOffset(i).getKnownMinValue()),
           Name + ".unpack");
+      // Adjust AA metadata to new offset and size.
+      AAMDNodes adjustedAANodes = LI.getAAMetadata().adjustForAccess(
+          SL->getElementOffset(i),
+          SL->getElementOffset(i).getKnownMinValue());
       // Propagate AA metadata. It'll still be valid on the narrowed load.
-      L->setAAMetadata(LI.getAAMetadata());
+      L->setAAMetadata(adjustedAANodes);
       copyInvariantLoadMetadata(LI, L);
       V = IC.Builder.CreateInsertValue(V, L, i);
     }