Looks like the Tools/clang/ReportMemoryUsagePlugin clang plugin had to deal with the old reportMemoryUsage Inspector memory instrumentation that was removed a long time ago. So it is no longer needed and can be removed.
Created attachment 227073 [details] [PATCH] Proposed Fix
Comment on attachment 227073 [details] [PATCH] Proposed Fix r=me
Comment on attachment 227073 [details] [PATCH] Proposed Fix Clearing flags on attachment: 227073 Committed r165833: <http://trac.webkit.org/changeset/165833>
All reviewed patches have been landed. Closing bug.
<rdar://problem/16357618>