8040213: C2 does not put all modified nodes on IGVN worklist
Summary: Verification code is added that checks if modified nodes are put on the IGVN worklist and modified nodes are processed by 'PhaseIterGVN::transform_old()'
Reviewed-by: kvn, jrose
8050860: Cleanup TypeTuple and TypeFunc
Summary: Declared fields TypeFunc::_domain, TypeFunc::_range, TypeTuple::_cnt and TypeTuple::_fields private, changed direct accesses to fields to use accessor methods.
Reviewed-by: kvn, vlivanov
Contributed-by: Zoltan Majo <zoltan.majo@oracle.com>