8228388: Add information about dirty/skipped card for Merge HCC in G1 log Summary: Collect and print informatio about the number of processed cards during the Merge HCC phase to improve log output. Reviewed-by: kbarrett, sangheki

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
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test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*
.*/.git/.*