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/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
index e1df5c2..5039287 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
@@ -25,7 +25,7 @@
   class X86WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
   public:
     X86WinCOFFObjectWriter(bool Is64Bit);
-    virtual ~X86WinCOFFObjectWriter();
+    ~X86WinCOFFObjectWriter() override;
 
     unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
                           bool IsCrossSection,