Merge pull request #465 from jhawthorn/c_commonmarker #1658

Job	Run time
benchmark-ractor-only (head)	38s
benchmark-run-once	1m 39s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,railsbench,ruby-lsp,shipit)	12m 14s
benchmark-default (head)	13m 0s
benchmark-graph	45s
test (head)	57s
benchmark-ractor (head)	6m 42s
test (ruby)	54s
benchmark-default (ruby)	13m 32s
test (truffleruby)	1m 51s
all-tests	3s
	52m 15s

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