i965/vec4: Don't set header_present if texel offsets are all 0.
In theory, a shader might use textureOffset() but set all the texel offsets to zero. In that case, we don't actually need to set up the message header - zero is the implicit default. By moving the texture_offset setup before the header_present setup, we can easily only set header_present when there are non-zero texel offset values. Signed-off-by: Kenneth Graunke <email@example.com> Reviewed-by: Matt Turner <firstname.lastname@example.org> Reviewed-by: Chris Forbes <email@example.com>
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