Bug ID: JDK-8269120 Build failure with GCC 6.3.0 after JDK-8017163

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JDK 18
18 b04Fixed

One of my CI servers fails after JDK-8017163 with:

In file included from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CardSetFreeMemoryTask.hpp:29:0,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CollectedHeap.hpp:31,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CollectedHeap.inline.hpp:28,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/heapRegion.inline.hpp:31,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1AllocRegion.inline.hpp:30,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1AllocRegion.cpp:26:
/home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CardSetMemory.hpp:203:54: error: template argument 2 is invalid
   typedef LockFreeStack<G1CardSetContainer, &next_ptr> NodeStack;
                                                      ^

I believe the cause is that next_ptr is the member of template<class Elem> class G1CardSetAllocator, so this confuses the compiler.