"Combine RGB" and "Separate RGB" material nodes:

These nodes allow the user to separate and combine RGB color channels
as in the composite node editor. However they don't contain Alpha
channel as it is treated separately in case of material nodes.
"Combine RGB" allows the user to use values beyond standard float range 
([0.0, 1.0]) if value input node is used to feed the value to it.

source/blender/blenkernel/BKE_node.h

@@ -206,6 +206,8 @@ struct ShadeResult;
 #define SH_NODE_SQUEEZE		117
 #define SH_NODE_MATERIAL_EXT	118
 #define SH_NODE_INVERT		119
+#define SH_NODE_SEPRGB		120
+#define SH_NODE_COMBRGB		121
 
 
 /* custom defines options for Material node */

source/blender/blenkernel/intern/node.c

@@ -2389,6 +2389,8 @@ static void registerShaderNodes(ListBase *ntypelist)
 	nodeRegisterType(ntypelist, &sh_node_rgb);
 	nodeRegisterType(ntypelist, &sh_node_texture);
 	nodeRegisterType(ntypelist, &sh_node_invert);
+	nodeRegisterType(ntypelist, &sh_node_seprgb);
+	nodeRegisterType(ntypelist, &sh_node_combrgb);
 }
 
 void init_nodesystem(void) 

source/blender/nodes/SHD_node.h

@@ -58,6 +58,9 @@ extern bNodeType sh_node_vect_math;
 extern bNodeType sh_node_squeeze;
 extern bNodeType sh_node_material_ext;
 extern bNodeType sh_node_invert;
+extern bNodeType sh_node_seprgb;
+extern bNodeType sh_node_combrgb;
+
 
 #endif