RFR: 8202640: Small C1 cleanups for BarrierSetC1

[Nils Eliasson]

Looks great!

// Nils


On 2018-05-04 11:33, Erik Österlund wrote:
> Hi,
>
> After rebasing ZGC to BarrierSetC1, we noticed a few small cleanups 
> that would be great.
>
> * restore_live_registers_except_rax should be exposed so that barrier 
> set backends may use it
> * save_live_registers_no_oop_map has an unused argument that should be 
> removed
> * LIR_OpVisitState::visit should allow visiting LIR with a virtual 
> call (for GC barrier LIR_Ops).
> * LIR_List::append ought to be public so that barrier set backends can 
> add barrier LIR_Ops.
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8202640
>
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8202640/webrev.00/
>
> Thanks,
> /Erik