intel/compiler: Implement untyped atomic float min, max, and compare-swap dataport messages

v2: Split changes to the message type field to another patch.  Suggested
by Caio.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/intel/compiler/brw_schedule_instructions.cpp

@@ -369,6 +369,7 @@ schedule_node::set_latency_gen7(bool is_haswell)
       break;
 
    case SHADER_OPCODE_UNTYPED_ATOMIC:
+   case SHADER_OPCODE_UNTYPED_ATOMIC_FLOAT:
    case SHADER_OPCODE_TYPED_ATOMIC:
       /* Test code:
        *   mov(8)    g112<1>ud       0x00000000ud       { align1 WE_all 1Q };