[Beignet] [PATCH] Generate most of the vector builtin functions automatically

[Zhigang Gong]

Hi,

As Beignet is using the SOA model, and we need to lower down all
the vector builtin functions to the scalar version. This type of
thing is ideal to use a script to generate all the code according
to the OpenCL's spec. I just copy/paste most of the prototypes from
the OpenCL spec and put them into builtin_vector_proto.def. Then
I wrote a python script to parse the spec and generate all the
vector inline functions and I removed all existing duplicate
functions in ocl_stdlib.h.

Now we have three parts of auto-generated code, the as/convert and
this vector related functions. The amount of these three parts are
much more than the other code in ocl_stdlib.h. To make the maintainance
easier, I split the auto-generated code out of the ocl_stdlib.h, and
refine the build process to generate one blob header file at build time.

Then I also made a new patch based on Junyan's PCH patch to accelerate
the cl kernel build speed.

As this patchset is handling tons of those auto-generated code, the
patch is relatively big. I just attached the compressed tar ball rather
than embed them directly.

Waiting for your comments. Thanks.
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