8220416: Comparison of klass pointers is not optimized any more
Summary: Enables dead klass pointer optimization (since JDK-6964458) again.
Reviewed-by: roland, thartmann
8230762: Change MacroAssembler::debug32/64 to use fatal instead of assert
Summary: Always call fatal from debug32/64 to also crash in product build as a follow-up to JDK-8225653.
Reviewed-by: roland, thartmann