[PATCH] Clang: Reject OpenCL workgroup size requirement of 0

[Pedro Ferreira]

OpenCL allows us to define the workgroup size used in a kernel in order 
to further optimise the code, specifically to that size.
The syntax is
__attribute__((reqd_work_group_size(X, Y, Z)))

where X, Y and Z are compile-time known integers.
Currently clang allows any of those to be 0, which would be illegal in 
OpenCL.

The attached patch adds this validation; it's currently a draft and any 
comments would be welcome.

(I reported this on bug 19699)
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