SILOptimizer: Teach visitAccessedAddress() about pack instructions

Author: slavapestov

lib/SIL/Utils/MemAccessUtils.cpp

@@ -2638,6 +2638,7 @@ void swift::visitAccessedAddress(SILInstruction *I,
 #include "swift/AST/ReferenceStorage.def"
   case SILInstructionKind::StoreInst:
   case SILInstructionKind::StoreBorrowInst:
+  case SILInstructionKind::PackElementSetInst:
     visitor(&I->getAllOperands()[StoreInst::Dest]);
     return;
 
@@ -2655,7 +2656,8 @@ void swift::visitAccessedAddress(SILInstruction *I,
   case SILInstructionKind::OpenExistentialAddrInst:
   case SILInstructionKind::SwitchEnumAddrInst:
   case SILInstructionKind::UncheckedTakeEnumDataAddrInst:
-  case SILInstructionKind::UnconditionalCheckedCastInst: {
+  case SILInstructionKind::UnconditionalCheckedCastInst:
+  case SILInstructionKind::PackElementGetInst: {
     // Assuming all the above have only a single address operand.
     assert(I->getNumOperands() - I->getNumTypeDependentOperands() == 1);
     Operand *singleOperand = &I->getAllOperands()[0];