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/native/java_lang_VMClassLoader.cc b/runtime/native/java_lang_VMClassLoader.cc
index 42c7ad5..1ad233a 100644
--- a/runtime/native/java_lang_VMClassLoader.cc
+++ b/runtime/native/java_lang_VMClassLoader.cc
@@ -86,7 +86,7 @@
   }
   // If class is erroneous, throw the earlier failure, wrapped in certain cases. See b/28787733.
   if (c != nullptr && c->IsErroneous()) {
-    cl->ThrowEarlierClassFailure(c.Ptr());
+    cl->ThrowEarlierClassFailure(c);
     Thread* self = soa.Self();
     ObjPtr<mirror::Class> iae_class =
         self->DecodeJObject(WellKnownClasses::java_lang_IllegalAccessError)->AsClass();