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/register_allocator_linear_scan.h b/compiler/optimizing/register_allocator_linear_scan.h
index 36788b7..4d445c7 100644
--- a/compiler/optimizing/register_allocator_linear_scan.h
+++ b/compiler/optimizing/register_allocator_linear_scan.h
@@ -42,11 +42,11 @@
   RegisterAllocatorLinearScan(ScopedArenaAllocator* allocator,
                               CodeGenerator* codegen,
                               const SsaLivenessAnalysis& analysis);
-  ~RegisterAllocatorLinearScan() OVERRIDE;
+  ~RegisterAllocatorLinearScan() override;
 
-  void AllocateRegisters() OVERRIDE;
+  void AllocateRegisters() override;
 
-  bool Validate(bool log_fatal_on_failure) OVERRIDE {
+  bool Validate(bool log_fatal_on_failure) override {
     processing_core_registers_ = true;
     if (!ValidateInternal(log_fatal_on_failure)) {
       return false;