8195148: Collapse G1SATBCardTableModRefBS and G1SATBCardTableLoggingModRefBS into a single G1BarrierSet

[Kim Barrett]

> On Mar 5, 2018, at 5:08 AM, Erik Österlund <erik.osterlund at oracle.com> wrote:
> 
> Hi Kim,
> 
> New full webrev:
> http://cr.openjdk.java.net/~eosterlund/8195148/webrev.01/
> 
> Incremental:
> http://cr.openjdk.java.net/~eosterlund/8195148/webrev.00_01/

src/hotspot/share/gc/g1/g1BarrierSet.inline.hpp
40   if (oopDesc::is_null(heap_oop)) {

Test is backward.

I’m not sure yet what the new include changes in other files are about.