workaround GitHub Actions on Ubuntu #1687

Job	Run time
acorn.sh --ie -c	5s
bootstrap.sh --ie -c	3s
buble.sh --ie -c	3s
butternut.sh --ie -c	3s
mathjs.sh --ie -c	5s
rollup-es.sh --ie -c	3s
rollup-ts.sh --ie -c	4s
sucrase.sh --ie -c	5s
web-tooling-benchmark.sh --ie -c	5s
acorn.sh -mb braces	3s
bootstrap.sh -mb braces	6s
buble.sh -mb braces	5s
butternut.sh -mb braces	4s
mathjs.sh -mb braces	3s
rollup-es.sh -mb braces	3s
rollup-ts.sh -mb braces	2s
sucrase.sh -mb braces	6s
web-tooling-benchmark.sh -mb braces	5s
acorn.sh --toplevel -mc	4s
bootstrap.sh --toplevel -mc	5s
buble.sh --toplevel -mc	3s
butternut.sh --toplevel -mc	4s
mathjs.sh --toplevel -mc	2s
rollup-es.sh --toplevel -mc	3s
rollup-ts.sh --toplevel -mc	42s
sucrase.sh --toplevel -mc	5s
web-tooling-benchmark.sh --toplevel -mc	6s
acorn.sh -p acorn -mco spidermonkey	3s
bootstrap.sh -p acorn -mco spidermonkey	3s
buble.sh -p acorn -mco spidermonkey	2s
butternut.sh -p acorn -mco spidermonkey	5s
mathjs.sh -p acorn -mco spidermonkey	4s
rollup-es.sh -p acorn -mco spidermonkey	4s
rollup-ts.sh -p acorn -mco spidermonkey	6s
sucrase.sh -p acorn -mco spidermonkey	3s
web-tooling-benchmark.sh -p acorn -mco spidermonkey	5s
acorn.sh -mc passes=3,pure_getters,unsafe	6s
bootstrap.sh -mc passes=3,pure_getters,unsafe	5s
buble.sh -mc passes=3,pure_getters,unsafe	4s
butternut.sh -mc passes=3,pure_getters,unsafe	4s
mathjs.sh -mc passes=3,pure_getters,unsafe	5s
rollup-es.sh -mc passes=3,pure_getters,unsafe	5s
rollup-ts.sh -mc passes=3,pure_getters,unsafe	4s
sucrase.sh -mc passes=3,pure_getters,unsafe	4s
web-tooling-benchmark.sh -mc passes=3,pure_getters,unsafe	8s
	3m 47s

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