Request for review JDK-8065402, , G1 does not expand marking stack when mark stack overflow happens during concurrent marking

[Alexander Harlap]

Please review change for JDK-8065402 
<https://bugs.openjdk.java.net/browse/JDK-8065402> - G1 does not expand 
marking stack when mark stack overflow happens during concurrent marking.

I added call to the G1CMMarkStack::expand() from 
G1ConcurrentMark::mark_from_roots().

I added comment and attachment to the JDK-8065402 
<https://bugs.openjdk.java.net/browse/JDK-8065402> with an explanation 
of testing.

Thank you,

Alex



<https://bugs.openjdk.java.net/browse/JDK-8065402>

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