Bug 1493447 - Add crashtest. r=mstange

Differential Revision: https://phabricator.services.mozilla.com/D7631

--HG--
extra : rebase_source : 4336e8f1c86c277d9638e81fe7e56ac62c9b7d7b

dom/svg/crashtests/1493447.html

@@ -0,0 +1,12 @@
+<svg>
+  <defs>
+    <filter id="F8" >
+      <feComponentTransfer>
+        <feFuncB type="discrete">
+        </feFuncB>
+      </feComponentTransfer>
+    </filter>
+  </defs>
+  <image width="10" height="10" filter="url(#F8)">
+  </image>
+</svg>

dom/svg/crashtests/crashtests.list

@@ -89,3 +89,4 @@ load 1419250-1.html
 load 1420492.html
 load 1477853.html
 load 1486488.html
+load 1493447.html