[sanitizer] POD-ify the allocator cache 

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@169514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/sanitizer_common/sanitizer_allocator.h b/lib/sanitizer_common/sanitizer_allocator.h
index caf5380..b3039d8 100644
--- a/lib/sanitizer_common/sanitizer_allocator.h
+++ b/lib/sanitizer_common/sanitizer_allocator.h
@@ -97,8 +97,7 @@
   AllocatorListNode *next;
 };
 
-class AllocatorFreeList: public IntrusiveList<AllocatorListNode> {
- public:
+struct AllocatorFreeList: IntrusiveList<AllocatorListNode> {
   // Move at most max_count chunks to other_free_list.
   void BulkAllocate(uptr max_count, AllocatorFreeList *other_free_list) {
     CHECK(!empty());