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/x86_memory_gen.cc b/compiler/optimizing/x86_memory_gen.cc
index f0069c0..b1abcf6 100644
--- a/compiler/optimizing/x86_memory_gen.cc
+++ b/compiler/optimizing/x86_memory_gen.cc
@@ -31,7 +31,7 @@
         do_implicit_null_checks_(do_implicit_null_checks) {}
 
  private:
-  void VisitBoundsCheck(HBoundsCheck* check) OVERRIDE {
+  void VisitBoundsCheck(HBoundsCheck* check) override {
     // Replace the length by the array itself, so that we can do compares to memory.
     HArrayLength* array_len = check->InputAt(1)->AsArrayLength();