Reassign the buffer to the pointer so that we don't overwrite memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61596 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/ImmutableSetTest.cpp b/unittests/ADT/ImmutableSetTest.cpp
index 2282cb8..74cd684 100644
--- a/unittests/ADT/ImmutableSetTest.cpp
+++ b/unittests/ADT/ImmutableSetTest.cpp
@@ -172,9 +172,11 @@
 
   ASSERT_EQ(obj.counter, 6);
 
+  ptr = buffer;
   S2.foreach<MyIter>(obj);
   ASSERT_EQ(obj.counter, 6+3);
 
+  ptr = buffer;
   S.foreach<MyIter>(obj);
   ASSERT_EQ(obj.counter, 6+3+0);
 }