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/utils/unittest/googletest/src/gtest-death-test.cc b/llvm/utils/unittest/googletest/src/gtest-death-test.cc
index 314dba2..47c1a15 100644
--- a/llvm/utils/unittest/googletest/src/gtest-death-test.cc
+++ b/llvm/utils/unittest/googletest/src/gtest-death-test.cc
@@ -334,10 +334,10 @@
         write_fd_(-1) {}
 
   // read_fd_ is expected to be closed and cleared by a derived class.
-  ~DeathTestImpl() { GTEST_DEATH_TEST_CHECK_(read_fd_ == -1); }
+  ~DeathTestImpl() override { GTEST_DEATH_TEST_CHECK_(read_fd_ == -1); }
 
-  void Abort(AbortReason reason);
-  virtual bool Passed(bool status_ok);
+  void Abort(AbortReason reason) override;
+  bool Passed(bool status_ok) override;
 
   const char* statement() const { return statement_; }
   const RE* regex() const { return regex_; }
@@ -744,7 +744,7 @@
   ForkingDeathTest(const char* statement, const RE* regex);
 
   // All of these virtual functions are inherited from DeathTest.
-  virtual int Wait();
+  int Wait() override;
 
  protected:
   void set_child_pid(pid_t child_pid) { child_pid_ = child_pid; }
@@ -780,7 +780,7 @@
  public:
   NoExecDeathTest(const char* a_statement, const RE* a_regex) :
       ForkingDeathTest(a_statement, a_regex) { }
-  virtual TestRole AssumeRole();
+  TestRole AssumeRole() override;
 };
 
 // The AssumeRole process for a fork-and-run death test.  It implements a
@@ -835,7 +835,8 @@
   ExecDeathTest(const char* a_statement, const RE* a_regex,
                 const char* file, int line) :
       ForkingDeathTest(a_statement, a_regex), file_(file), line_(line) { }
-  virtual TestRole AssumeRole();
+  TestRole AssumeRole() override;
+
  private:
   // The name of the file in which the death test is located.
   const char* const file_;