We may replace the non-default copy constructor and assignment with the default ones. This would also make the class TriviallyCopiable.

This change would also fix a build failure I'm getting with clang20:

/jdk/src/hotspot/share/oops/resolvedMethodEntry.cpp:43:12: error: first argument in call to 'memset' is a pointer to non-trivially copyable type 'ResolvedMethodEntry' [-Werror,-Wnontrivial-memcall]