SelectionDAG: Use unique_ptr for SwiftErrorValueTracking (llvm#142532)

Author: arsenm

llvm/include/llvm/CodeGen/SelectionDAGISel.h

@@ -47,7 +47,7 @@ class SelectionDAGISel {
   TargetMachine &TM;
   const TargetLibraryInfo *LibInfo;
   std::unique_ptr<FunctionLoweringInfo> FuncInfo;
-  SwiftErrorValueTracking *SwiftError;
+  std::unique_ptr<SwiftErrorValueTracking> SwiftError;
   MachineFunction *MF;
   MachineModuleInfo *MMI;
   MachineRegisterInfo *RegInfo;

llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -386,10 +386,7 @@ SelectionDAGISel::SelectionDAGISel(TargetMachine &tm, CodeGenOptLevel OL)
   initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
 }
 
-SelectionDAGISel::~SelectionDAGISel() {
-  delete CurDAG;
-  delete SwiftError;
-}
+SelectionDAGISel::~SelectionDAGISel() { delete CurDAG; }
 
 void SelectionDAGISelLegacy::getAnalysisUsage(AnalysisUsage &AU) const {
   CodeGenOptLevel OptLevel = Selector->OptLevel;