8201447: C1 does backedge profiling incorrectly Summary: Increment backedge counter only for backward arms of conditional branches. Reviewed-by: never, kvn

8189140: SystemDictionaryShared::initialize() should be renamed to be more meaningful Summary: Removed this function, added JavaCalls::construct_new_instance and moved SharedDictionary_lock Reviewed-by: jiangli, ccheung, dholmes, coleenp