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

mie/select/msg.c

@@ -0,0 +1,23 @@
+#include "builder.h"
+
+#include <mie/ctx.h>
+#include <mie/ir/ptr.h>
+#include <mie/select/graph.h>
+#include <mie/target/select.h>
+
+static enum mie_status push(
+	struct mie_select_builder *builder, struct mie_instr *instr)
+{
+	const struct mie_target *target = mie_select_builder_get_target(builder);
+	struct mie_msg *msg = (struct mie_msg *)instr;
+
+	struct mie_select_value result;
+	enum mie_status status
+		= mie_target_select_lower_msg(target, builder, msg, &result);
+
+	return mie_select_builder_set_value(builder, MIE_VALUE(instr), &result);
+}
+
+struct select_instr_type select_msg = {
+	.i_push = push,
+};