ART: Add operator == and != with nullptr to Handle

Get it in line with ObjPtr and prettify our code.

Test: m
Change-Id: I1322e2a9bc7a85d7f2441034a19bf4d807b81a0e
diff --git a/compiler/optimizing/inliner.cc b/compiler/optimizing/inliner.cc
index f0afccb..f1e8239 100644
--- a/compiler/optimizing/inliner.cc
+++ b/compiler/optimizing/inliner.cc
@@ -380,7 +380,7 @@
               soa.Self(),
               class_linker->GetClassRoot(ClassLinker::kClassArrayClass),
               InlineCache::kIndividualCacheSize));
-      if (inline_cache.Get() == nullptr) {
+      if (inline_cache == nullptr) {
         // We got an OOME. Just clear the exception, and don't inline.
         DCHECK(soa.Self()->IsExceptionPending());
         soa.Self()->ClearException();