Handle properties of builtin routine separately from builtin objects (#3694)

separate builtin routine part to make code clear and to support 'name' property later

JerryScript-DCO-1.0-Signed-off-by: HyukWoo Park [email protected]

Author: clover2123

jerry-core/ecma/base/ecma-globals.h

@@ -807,7 +807,15 @@ typedef struct
   uint8_t length_and_bitset_size; /**< length for built-in functions and
                                    *   bit set size for all built-ins */
   uint16_t routine_id; /**< routine id for built-in functions */
-  uint32_t instantiated_bitset[1]; /**< bit set for instantiated properties */
+  union
+  {
+    uint32_t instantiated_bitset[1]; /**< bit set for instantiated properties */
+    struct
+    {
+      uint16_t name; /**< name of the built-in functions */
+      uint16_t bitset; /**< bit set for instantiated properties of builtin functions */
+    } builtin_routine;
+  } u;
 } ecma_built_in_props_t;
 
 /**