[Beignet] 9e8874c breaking (more) Haswell systems?

[Rebecca N. Palmer]

http://cgit.freedesktop.org/beignet/commit/?h=Release_v1.0&id=9e8874c7a16b029d5b857a11ff9b23102752b4db 
was intended to catch the "silently does nothing on large arrays" bug, 
and does so (with the message "drm_intel_gem_bo_context_exec() failed: 
No space left on device").

However, a user reports that it also breaks a previously 
working-without-workarounds Haswell system, with 
"drm_intel_gem_bo_context_exec() failed: Invalid argument": 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781875#46

The usual i915_cmd_parser workaround did work, so it might be a good 
idea to suggest it in this error message.  (The Debian kernel does have 
c9224fa..., https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767148 , 
but as noted earlier this isn't enough for all Haswell systems.)