r144527 broke this when skipped all raw pointers in the memory instrumentation traversal algorithm. Now we don't see JS externals arrays in the native memory snapshot.
Created attachment 196154 [details] Patch
Comment on attachment 196154 [details] Patch LGTM
Comment on attachment 196154 [details] Patch Clearing flags on attachment: 196154 Committed r147465: <http://trac.webkit.org/changeset/147465>
All reviewed patches have been landed. Closing bug.