Cycles: Cleanup, move EdgeMap to blender_util

it's better place for such an utility structure. Still not fully ideal tho.

intern/cycles/blender/blender_mesh.cpp

@@ -524,36 +524,6 @@ static void attr_create_uv_map(Scene *scene,
 	}
 }
 
-/* TODO(sergey): Move this to some better place? */
-class EdgeMap {
-public:
-	EdgeMap() {
-	}
-
-	void clear() {
-		edges_.clear();
-	}
-
-	void insert(int v0, int v1) {
-		get_sorted_verts(v0, v1);
-		edges_.insert(std::pair<int, int>(v0, v1));
-	}
-
-	bool exists(int v0, int v1) {
-		get_sorted_verts(v0, v1);
-		return edges_.find(std::pair<int, int>(v0, v1)) != edges_.end();
-	}
-
-protected:
-	void get_sorted_verts(int& v0, int& v1) {
-		if(v0 > v1) {
-			swap(v0, v1);
-		}
-	}
-
-	set< std::pair<int, int> > edges_;
-};
-
 /* Create vertex pointiness attributes. */
 static void attr_create_pointiness(Scene *scene,
                                    Mesh *mesh,

intern/cycles/blender/blender_util.h

@@ -19,6 +19,7 @@
 
 #include "mesh.h"
 
+#include "util_algorithm.h"
 #include "util_map.h"
 #include "util_path.h"
 #include "util_set.h"
@@ -786,6 +787,35 @@ struct ParticleSystemKey {
 	}
 };
 
+class EdgeMap {
+public:
+	EdgeMap() {
+	}
+
+	void clear() {
+		edges_.clear();
+	}
+
+	void insert(int v0, int v1) {
+		get_sorted_verts(v0, v1);
+		edges_.insert(std::pair<int, int>(v0, v1));
+	}
+
+	bool exists(int v0, int v1) {
+		get_sorted_verts(v0, v1);
+		return edges_.find(std::pair<int, int>(v0, v1)) != edges_.end();
+	}
+
+protected:
+	void get_sorted_verts(int& v0, int& v1) {
+		if(v0 > v1) {
+			swap(v0, v1);
+		}
+	}
+
+	set< std::pair<int, int> > edges_;
+};
+
 CCL_NAMESPACE_END
 
 #endif /* __BLENDER_UTIL_H__ */