[8] RFR: Revert leftover changes in type.{cpp|hpp}

[Aleksey Shipilev]

https://cr.openjdk.java.net/~shade/shenandoah/8u-type-revert/webrev.01/

Comparing to upstream, there is an awkward change in Type::make_oopptr. If we remove it, tests start
to assert in need_barrier_impl. I prefer to work that around in Shenandoah code, rather than let it
leak into the shared one.

Testing: hotspot_gc_shenandoah {fastdebug,release}

-- 
Thanks,
-Aleksey