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.h b/compiler/optimizing/ssa_liveness_analysis.h
index cebd4ad..97c00c9 100644
--- a/compiler/optimizing/ssa_liveness_analysis.h
+++ b/compiler/optimizing/ssa_liveness_analysis.h
@@ -60,7 +60,7 @@
  * A live range contains the start and end of a range where an instruction or a temporary
  * is live.
  */
-class LiveRange FINAL : public ArenaObject<kArenaAllocSsaLiveness> {
+class LiveRange final : public ArenaObject<kArenaAllocSsaLiveness> {
  public:
   LiveRange(size_t start, size_t end, LiveRange* next) : start_(start), end_(end), next_(next) {
     DCHECK_LT(start, end);