this is really Dave's work, with a few touch-ups from me that I think make
sense. I've kept those separate with the intention to squash. I'd like to
land these in master even before the main ARB_gpu_shader_int64 stuff lands
(that is currently in Ian's court).
The reason is that radeonsi's ARB_query_buffer_object support needs 64-bit
integers in shaders, and for that it's convenient to have all the TGSI
opcodes and gallivm bits in place already.
Any objections? Reviews?
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