Use unique_ptr to clarify ownership of ScopStmt

llvm-svn: 238090
diff --git a/polly/lib/CodeGen/IRBuilder.cpp b/polly/lib/CodeGen/IRBuilder.cpp
index 53eafb8..ff1ba1b 100644
--- a/polly/lib/CodeGen/IRBuilder.cpp
+++ b/polly/lib/CodeGen/IRBuilder.cpp
@@ -59,7 +59,7 @@
   OtherAliasScopeListMap.clear();
 
   SetVector<Value *> BasePtrs;
-  for (ScopStmt *Stmt : S)
+  for (auto &Stmt : S)
     for (MemoryAccess *MA : *Stmt)
       BasePtrs.insert(MA->getBaseAddr());