6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.") Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it. Reviewed-by: johnc, jmasa, jcoomes, ysr

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README:

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  This file should be located at the top of the hotspot Mercurial repository.

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  See http://openjdk.java.net/ for more information about the OpenJDK.

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  See ../README-builds.html for complete details on build machine requirements.

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Simple Build Instructions:

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    cd make && gnumake

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  The files that will be imported into the jdk build will be in the "build"

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  directory.

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