Assert that reversed loads + stores always use VPVectorEndPointerRecipe addresses

Author: lukel97

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -3234,6 +3234,9 @@ struct LLVM_ABI_FOR_TEST VPWidenLoadRecipe final : public VPWidenMemoryRecipe,
       : VPWidenMemoryRecipe(VPDef::VPWidenLoadSC, Load, {Addr}, Consecutive,
                             Reverse, Metadata, DL),
         VPValue(this, &Load) {
+    assert(isa<VPVectorEndPointerRecipe>(Addr) ||
+           !Reverse &&
+               "Reversed load without VPVectorEndPointerRecipe address?");
     setMask(Mask);
   }
 
@@ -3313,6 +3316,9 @@ struct LLVM_ABI_FOR_TEST VPWidenStoreRecipe final : public VPWidenMemoryRecipe {
                      const VPIRMetadata &Metadata, DebugLoc DL)
       : VPWidenMemoryRecipe(VPDef::VPWidenStoreSC, Store, {Addr, StoredVal},
                             Consecutive, Reverse, Metadata, DL) {
+    assert(isa<VPVectorEndPointerRecipe>(Addr) ||
+           !Reverse &&
+               "Reversed store without VPVectorEndPointerRecipe address?");
     setMask(Mask);
   }