8133042: Remove some direct accesses of G1Allocator to G1CollectedHeap members Summary: Remove direct access to private members of G1CollectedHeap from G1Allocator and G1ArchiveAllocator. Allows removal of friend delcarations. Reviewed-by: kbarrett, jmasa, jwilhelm

^build/
^dist/
^drop/
^drop_included/
^webrev
/nbproject/private/
^.hgtip
.DS_Store