Go back to C commonmarker #1657

Job	Run time
benchmark-graph	46s
test (ruby)	54s
benchmark-ractor-only (head)	47s
test (truffleruby)	1m 48s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,railsbench,ruby-lsp,shipit)	12m 14s
benchmark-run-once	1m 35s
benchmark-ractor (head)	6m 49s
benchmark-default (head)	12m 52s
benchmark-default (ruby)	13m 7s
test (head)	55s
all-tests	3s
	51m 50s

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