[Beignet] [BUG]Unused sampler_t in kernel function get wrong arg_size on 64bit system

[Song, Ruiling]

If write a kernel function declare a sampler_t without using the sampler.

__kernel void kernel_func(sampler_t sp) { }

When user tries to set it using clSetKernelArg(k,0, sizeof(cl_sampler), &sampler), he will get INVALID_ARG_SIZE error.
The reason looks like the kernel argument was processed as FunctionArgument::VALUE instead of FunctionArgument::SAMPLER.
So, user passed sizeof(cl_sampler) which is 8, but the arg_size get from kernel is 4 on 64bit system.

This bug comes from PIGLIT api test cl-set-kernel-arg.

Thanks!
Ruiling

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