upstream #1027

Job	Run time
jruby-head	1m 13s
html5lib-tests	41s
ruby-head (ubuntu, enable)	2m 56s
ruby-head-valgrind (disable)	7m 50s
ruby-head (ubuntu, disable)	47s
truffleruby-head (--disable-system-libraries --disable-static)	3m 3s
ruby-head (windows, enable)	3m 29s
xmlsoft-head (ubuntu)	3m 45s
xmlsoft-head-valgrind	6m 45s
truffleruby-head (--disable-system-libraries --enable-static)	5m 24s
ruby-head (windows, disable)	5m 34s
xmlsoft-head (windows)	11m 29s
truffleruby-head (--enable-system-libraries)	2m 29s
xmlsoft-head (macos)	4m 25s
ruby-head (macos, enable)	29s
ruby-head (macos, disable)	3m 17s
	1h 3m 36s

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