Patch forthcoming.
https://build.webkit.org/results/Apple%20El%20Capitan%20Release%20WK2%20(Tests)/r195417%20(2656)/svg/animations/animation-dependency-crash-crash-log.txt
Created attachment 269485 [details] the patch
Comment on attachment 269485 [details] the patch r=me
I will wait for EWS and then land.
Landed in http://trac.webkit.org/changeset/195420