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/DebugInfo/DWARF/DWARFDebugFrame.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
index 9f56214..7846529 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
@@ -197,8 +197,7 @@
         DataAlignmentFactor(DataAlignmentFactor),
         ReturnAddressRegister(ReturnAddressRegister) {}
 
-  ~CIE() {
-  }
+  ~CIE() override {}
 
   uint64_t getCodeAlignmentFactor() const { return CodeAlignmentFactor; }
   int64_t getDataAlignmentFactor() const { return DataAlignmentFactor; }
@@ -245,8 +244,7 @@
         InitialLocation(InitialLocation), AddressRange(AddressRange),
         LinkedCIE(Cie) {}
 
-  ~FDE() {
-  }
+  ~FDE() override {}
 
   CIE *getLinkedCIE() const { return LinkedCIE; }