hg: jdk/sandbox: 8247908: Replace IsRegisteredEnum with std::is_enum

[chris.hegarty at oracle.com]

Changeset: 58d68d70acc9
Author:    kbarrett
Date:      2020-07-24 04:29 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/58d68d70acc9

8247908: Replace IsRegisteredEnum with std::is_enum
Reviewed-by: tschatzl, dholmes

! src/hotspot/share/aot/aotCodeHeap.hpp
- src/hotspot/share/metaprogramming/isRegisteredEnum.hpp
! src/hotspot/share/metaprogramming/primitiveConversions.hpp
! src/hotspot/share/runtime/atomic.hpp
! src/hotspot/share/runtime/objectMonitor.hpp
! src/hotspot/share/runtime/os.hpp
! src/hotspot/share/services/attachListener.hpp
- test/hotspot/gtest/metaprogramming/test_isRegisteredEnum.cpp
! test/hotspot/gtest/utilities/test_globalCounter_nested.cpp