i965: Use SET_FIELD to safety check our x/y offsets in blits.

The earlier assert made sure that our math didn't exceed our bounds, but
this makes sure that we don't overflow from the high bits X into the low
bits of Y.  We've already put checks in intel_miptree_blit(), but I've
wanted to expand the type in our protoype from short to uint32_t, and we
could get in trouble with intel_emit_linear_blit() if we did.

v2: Add Ken's comment about the funny language extension used.

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]> (v1)
Reviewed-by: Anuj Phogat <[email protected]> (v1)

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