upstream #1056

Job	Run time
html5lib-tests	47s
ruby-head-valgrind (disable)	10m 16s
jruby-head	1m 7s
ruby-head (ubuntu, enable)	42s
ruby-head (ubuntu, disable)	46s
truffleruby-head (--disable-system-libraries --disable-static)	3m 10s
ruby-head (windows, enable)	3m 34s
xmlsoft-head (ubuntu)	1m 36s
xmlsoft-head-valgrind	6m 9s
truffleruby-head (--disable-system-libraries --enable-static)	3m 14s
xmlsoft-head (windows)	9m 6s
ruby-head (windows, disable)	4m 38s
truffleruby-head (--enable-system-libraries)	2m 26s
xmlsoft-head (macos)	1m 25s
ruby-head (macos, enable)	31s
ruby-head (macos, disable)	1m 18s
	50m 45s

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