[SILCombine] Keep ued(deiniting).

It's not allowed to replace ued(enum(x)) with x if the enum in question
has a deinit.

Author: nate-chandler

lib/SILOptimizer/Analysis/SimplifyInstruction.cpp

@@ -172,6 +172,8 @@ SILValue InstSimplifier::visitStructExtractInst(StructExtractInst *sei) {
 
 SILValue
 InstSimplifier::visitUncheckedEnumDataInst(UncheckedEnumDataInst *uedi) {
+  if (uedi->getOperand()->getType().isValueTypeWithDeinit())
+    return SILValue();
   // (unchecked_enum_data (enum payload)) -> payload
   auto opt = lookThroughOwnershipInsts(uedi->getOperand());
   if (auto *ei = dyn_cast<EnumInst>(opt)) {

lib/SILOptimizer/Utils/CanonicalizeInstruction.cpp

@@ -549,6 +549,10 @@ eliminateUnneededForwardingUnarySingleValueInst(SingleValueInstruction *inst,
   auto next = std::next(inst->getIterator());
   if (isa<DropDeinitInst>(inst))
     return next;
+  if (auto *uedi = dyn_cast<UncheckedEnumDataInst>(inst)) {
+    if (uedi->getOperand()->getType().isValueTypeWithDeinit())
+      return next;
+  }
   for (auto *use : getNonDebugUses(inst)) {
     if (auto *destroy = dyn_cast<DestroyValueInst>(use->getUser())) {
       if (destroy->isFullDeinitialization())