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

llvm-svn: 234679
diff --git a/llvm/lib/CodeGen/AsmPrinter/Win64Exception.h b/llvm/lib/CodeGen/AsmPrinter/Win64Exception.h
index eb02ca4..5f4237f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/Win64Exception.h
+++ b/llvm/lib/CodeGen/AsmPrinter/Win64Exception.h
@@ -43,7 +43,7 @@
   // Main entry points.
   //
   Win64Exception(AsmPrinter *A);
-  virtual ~Win64Exception();
+  ~Win64Exception() override;
 
   /// Emit all exception information that should come after the content.
   void endModule() override;