i965/disasm: Add missing message type for Gen7 DP untyped surface read

This is used to implement GLSL's atomicCounter() intrinsic. Previously
it *worked*, but the disassembly was bogus.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
1 file changed