upstream #1021

Job	Run time
html5lib-tests	52s
jruby-head	1m 26s
ruby-head (ubuntu, enable)	2m 54s
ruby-head-valgrind (disable)	7m 59s
ruby-head (ubuntu, disable)	59s
truffleruby-head (--disable-system-libraries --disable-static)	3m 12s
ruby-head (windows, enable)	3m 37s
xmlsoft-head (ubuntu)	1m 31s
truffleruby-head (--disable-system-libraries --enable-static)	5m 26s
xmlsoft-head-valgrind	6m 31s
ruby-head (windows, disable)	5m 42s
xmlsoft-head (windows)	9m 28s
truffleruby-head (--enable-system-libraries)	2m 44s
ruby-head (macos, enable)	33s
xmlsoft-head (macos)	1m 27s
ruby-head (macos, disable)	3m 18s
	57m 39s

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