[Piglit] [RFC] Python-based CL integer builtin test geneator

[Aaron Watry]

I've been working one a python-based test generator for OpenCL built-in
functions which operate on integer data types. The Python was originally
based on something from tstellar, but it's been mostly re-written.

Currently, the test list is only complete for the 'char' data type, but
I wanted to send this out now to get some initial review (and see if I'm
headed in the right direction).

This will need to be integrated into the test harness before merging,
but it can currently be run by hand with:
python builtins-gen.py

It will create a file named:
builtin-char-1.1.python_generated.program_test

Thanks for any responses,
Aaron