Created attachment 79504 [details]
Results of OpenCL test

BREAKTHROUGH!

OpenCL works. Kinda. Tried the following kernel:
__kernel void add(__global const uint *a,  __global const uint *b, __global
uint *c){
    c[0]=1;
}
Complicated operations such as addition, memory loads, getting global ID, etc.
fail with Cannot select errors.
I have no idea if this has worked with earlier LLVM/mesa.

After the kernel is run, the 0-th element of c is equal to 1. I've attached
full source code and outputs for various kernels.