[IPO] Fix a warning

This patch fixes:

  llvm/include/llvm/Transforms/IPO/Attributor.h:1233:3: error:
  'llvm::InformationCache' has virtual functions but non-virtual
  destructor [-Werror,-Wnon-virtual-dtor]

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
index 97876877..1c589fb 100644
--- a/llvm/include/llvm/Transforms/IPO/Attributor.h
+++ b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -1230,7 +1230,7 @@ struct InformationCache {
           });
   }
 
-  ~InformationCache() {
+  virtual ~InformationCache() {
     // The FunctionInfo objects are allocated via a BumpPtrAllocator, we call
     // the destructor manually.
     for (auto &It : FuncInfoMap)