[OpenCL patch] vector logical operations (not, and, or) ** revised **

Hi Tanya,

Do you have some time to resubmit support for vector logical operations in
OpenCL [1] following Peter's suggestions [2] (which I support)?

Many thanks,
Anton.

[1] http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/013926.html
[2] http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-March/014263.html