The function sizeAndAllocFrameForVarargs really only sizes a call frame for a varArgs call. It and the related functions should be renamed, removing "AndAllocate" from their names.
Created attachment 219617 [details] Patch
Created attachment 219618 [details] Patch with right defect referenced in ChangeLog
Comment on attachment 219618 [details] Patch with right defect referenced in ChangeLog r=me
Committed r160831: <http://trac.webkit.org/changeset/160831>