existskey is another common op.

src/jit/graph.c

@@ -141,6 +141,7 @@ static void * op_to_func(MVMThreadContext *tc, MVMint16 opcode) {
     case MVM_OP_shift_o: return &MVM_repr_shift_o;
     case MVM_OP_pop_i: return &MVM_repr_pop_i;
     case MVM_OP_shift_i: return &MVM_repr_shift_i;
+    case MVM_OP_existskey: return &MVM_repr_exists_key;
     case MVM_OP_atpos_o: return &MVM_repr_at_pos_o;
     case MVM_OP_atpos_i: return &MVM_repr_at_pos_i;
     case MVM_OP_atkey_o: return &MVM_repr_at_key_o;
@@ -581,6 +582,16 @@ static MVMint32 jgb_consume_ins(MVMThreadContext *tc, JitGraphBuilder *jgb,
         jgb_append_call_c(tc, jgb, op_to_func(tc, op), 2, args, MVM_JIT_RV_INT, dst);
         break;
     }
+    case MVM_OP_existskey: {
+        MVMint16 dst = ins->operands[0].reg.orig;
+        MVMint32 invocant = ins->operands[1].reg.orig;
+        MVMint32 key = ins->operands[2].reg.orig;
+        MVMJitCallArg args[] = { { MVM_JIT_INTERP_VAR, MVM_JIT_INTERP_TC },
+                                 { MVM_JIT_REG_VAL, invocant },
+                                 { MVM_JIT_REG_VAL, key } };
+        jgb_append_call_c(tc, jgb, op_to_func(tc, op), 3, args, MVM_JIT_RV_INT, dst);
+        break;
+    }
     case MVM_OP_atpos_o: {
         MVMint16 dst = ins->operands[0].reg.orig;
         MVMint32 invocant = ins->operands[1].reg.orig;