nvc0/ir: actually emit AFETCH on kepler

Looks like this was forgotten in the commit which added the AFETCH
logic.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: mesa-stable@lists.freedesktop.org

src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp

@@ -2357,6 +2357,9 @@ CodeEmitterNVC0::emitInstruction(Instruction *insn)
    case OP_PFETCH:
       emitPFETCH(insn);
       break;
+   case OP_AFETCH:
+      emitAFETCH(insn);
+      break;
    case OP_EMIT:
    case OP_RESTART:
       emitOUT(insn);