setup structure for graph coloring

include/opt/confgraph.h

@@ -0,0 +1,21 @@
+#pragma once
+#include "IR/IR_basic.h"
+#include "cfg.h"
+class ConfGraphNode {
+ public:
+  std::string var_name;
+  size_t color;
+  bool is_move_related;
+  bool move_related_but_frozen;
+  bool is_binded_with_physical_reg;
+  std::vector<ConfGraphNode *> neighbors;
+  ConfGraphNode(std::string var_name) : var_name(var_name) {}
+};
+class ConfGraph {
+ public:
+  std::unordered_map<std::string, ConfGraphNode *> name_to_node;
+  std::vector<std::shared_ptr<ConfGraphNode>> nodes;
+};
+
+ConfGraph BuildConfGraph(CFGType &cfg);
+bool TryColoring(std::shared_ptr<FunctionDefItem> src, CFGType &cfg, ConfGraph& confgraph);