ObjPtr<>-ify array allocations.

And remove some unnecessary calls to ObjPtr<>::Ptr().

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 31113334
Change-Id: Ie313980f7f23b33b0ccea4fa8d5131d643c59080
diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index 5d420aa..e40f1db 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -233,8 +233,7 @@
     ObjPtr<mirror::Class> direct_interface1 =
         mirror::Class::GetDirectInterface(self, array.Get(), 1);
     EXPECT_STREQ(direct_interface1->GetDescriptor(&temp), "Ljava/io/Serializable;");
-    ObjPtr<mirror::Class> array_ptr = array->GetComponentType();
-    EXPECT_OBJ_PTR_EQ(class_linker_->FindArrayClass(self, &array_ptr), array.Get());
+    EXPECT_OBJ_PTR_EQ(class_linker_->FindArrayClass(self, array->GetComponentType()), array.Get());
 
     PointerSize pointer_size = class_linker_->GetImagePointerSize();
     ObjPtr<mirror::Class> JavaLangObject =