Use 'final' and 'override' specifiers directly in ART.

Remove all uses of macros 'FINAL' and 'OVERRIDE' and replace them with
'final' and 'override' specifiers. Remove all definitions of these
macros as well, which were located in these files:
- libartbase/base/macros.h
- test/913-heaps/heaps.cc
- test/ti-agent/ti_macros.h

ART is now using C++14; the 'final' and 'override' specifiers have
been introduced in C++11.

Test: mmma art
Change-Id: I256c7758155a71a2940ef2574925a44076feeebf
diff --git a/compiler/optimizing/ssa_liveness_analysis_test.cc b/compiler/optimizing/ssa_liveness_analysis_test.cc
index a683c69..4b52553 100644
--- a/compiler/optimizing/ssa_liveness_analysis_test.cc
+++ b/compiler/optimizing/ssa_liveness_analysis_test.cc
@@ -29,7 +29,7 @@
 
 class SsaLivenessAnalysisTest : public OptimizingUnitTest {
  protected:
-  void SetUp() OVERRIDE {
+  void SetUp() override {
     OptimizingUnitTest::SetUp();
     graph_ = CreateGraph();
     codegen_ = CodeGenerator::Create(graph_, *compiler_options_);