Use 'override/final' instead of 'virtual' for overridden methods

The patch is generated using clang-tidy misc-use-override check.

This command was used:

  tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py \
    -checks='-*,misc-use-override' -header-filter='llvm|clang' \
    -j=32 -fix -format

http://reviews.llvm.org/D8925



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234679 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/CFLAliasAnalysis.cpp

@@ -161,7 +161,7 @@ struct FunctionHandle : public CallbackVH {
     assert(CFLAA != nullptr);
   }
 
-  virtual ~FunctionHandle() {}
+  ~FunctionHandle() override {}
 
   void deleted() override { removeSelfFromCache(); }
   void allUsesReplacedWith(Value *) override { removeSelfFromCache(); }
@@ -189,7 +189,7 @@ public:
     initializeCFLAliasAnalysisPass(*PassRegistry::getPassRegistry());
   }
 
-  virtual ~CFLAliasAnalysis() {}
+  ~CFLAliasAnalysis() override {}
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AliasAnalysis::getAnalysisUsage(AU);