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/code_sinking.h b/compiler/optimizing/code_sinking.h
index 5db0b6d..8eb3a52 100644
--- a/compiler/optimizing/code_sinking.h
+++ b/compiler/optimizing/code_sinking.h
@@ -33,7 +33,7 @@
               const char* name = kCodeSinkingPassName)
       : HOptimization(graph, name, stats) {}
 
-  bool Run() OVERRIDE;
+  bool Run() override;
 
   static constexpr const char* kCodeSinkingPassName = "code_sinking";