intel/compiler: Add LSC messages to brw_schedule_instructions

v2 (Jason Ekstrand):
 - Use lsc_msg_desc_opcode()
 - Drop all opcodes for now and add them in later patches.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11600>

src/intel/compiler/brw_schedule_instructions.cpp

@@ -528,6 +528,15 @@ schedule_node::set_latency_gfx7(bool is_haswell)
          }
          break;
 
+      case GFX12_SFID_UGM:
+      case GFX12_SFID_TGM:
+      case GFX12_SFID_SLM:
+         switch (lsc_msg_desc_opcode(devinfo, inst->desc)) {
+         default:
+            unreachable("unsupported new data port message instruction");
+         }
+         break;
+
       case GEN_RT_SFID_BINDLESS_THREAD_DISPATCH:
       case GEN_RT_SFID_RAY_TRACE_ACCELERATOR:
          /* TODO.