r600g: handle PIPE_QUERY_GPU_FINISHED
r600g: check for PIPE_BIND_BLENDABLE in is_format_supported

v2: added !util_format_is_depth_or_stencil(format)
r600g: add support for disabling viewport

Signed-off-by: David Heidelberger <david.heidelberger@ixit.cz>
r600g: add support for disabling clipping
r600g: support all channels of TGSI_FILE_ADDRESS

It's allowed in SM3.
r600g: implement TGSI_OPCODE_BREAKC
r600g: HW bug workaround for TGSI_OPCODE_BREAKC