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

unittests/Analysis/ScalarEvolutionTest.cpp

@@ -25,7 +25,7 @@ namespace {
 class ScalarEvolutionsTest : public testing::Test {
 protected:
   ScalarEvolutionsTest() : M("", Context), SE(*new ScalarEvolution) {}
-  ~ScalarEvolutionsTest() {
+  ~ScalarEvolutionsTest() override {
     // Manually clean up, since we allocated new SCEV objects after the
     // pass was finished.
     SE.releaseMemory();