The failing tests are fast/text/softbank-emoji.html [ Failure ] fast/text/tatechuyoko.html [ Failure ] fast/text/emoji-overlap.html [ ImageOnlyFailure ] fast/text/multiple-codeunit-vertical-upright.html [ ImageOnlyFailure ]
There is a new failing emoji test after r218371 : fast/text/system-font-fallback-emoji.html In the case of fast/text/softbank-emoji.html and fast/text/system-font-fallback-emoji.html they want to use a font named AppleColorEmoji (which I guess is not available on non-apple platforms).