mie: select: add support for target-specific nodes and lowering operations

mie/target/select.c

@@ -20,6 +20,7 @@ static size_t node_name(
 		NODE_NAME(COPY_FROM_REG, "CopyFromReg");
 		NODE_NAME(COPY_TO_REG, "CopyToReg");
 		NODE_NAME(GLOBAL_ADDRESS, "GlobalAddress");
+		NODE_NAME(CHAIN_GROUP, "ChainGroup");
 		NODE_NAME(LOAD, "Load");
 		NODE_NAME(STORE, "Store");
 		NODE_NAME(ADD, "Add");