Request for review JDK-8165674 - G1CMMarkStack::out_of_memory possibly redundant

[Alexander Harlap]

Please review change for JDK-8165674 
<https://bugs.openjdk.java.net/browse/JDK-8165674>- 
G1CMMarkStack::out_of_memory possibly redundant.

Change is located at http://cr.openjdk.java.net/~aharlap/8165674/webrev.01/

JDK-8165674 states that the G1CMMarkStack::_out_of_memory member may be 
redundant,
just mirroring the value of G1ConcurrentMark::_has_overflown.

Attached is proof of redundancy (based on some data flow analysis)

Alex

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