RFR: JDK-8199612: Replace remaining uses of G1BarrierSet::enqueue() with appropriate Access API calls

[Roman Kennke]

We still have 2 places where we call directly to
G1BarrierSet::enqueue(), those should use the appropriate Access API
instead.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8199612
Webrev:
http://cr.openjdk.java.net/~rkennke/8199612/webrev.00/

Passes: tier1_runtime tests, currently running all of tier1

Please review!

Thanks, Roman

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