Rework Map object (#2760)

This patch reworks the core of the builtin Map object.

Advantages:
 - Provide sublinear access time for the elements via Lcache and property hashmap
 - This implementation is suitable for the builtin Set object as well

Also add the missing 'forEach' routine for the builtin object as well.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/lit/lit-magic-strings.h

@@ -47,6 +47,7 @@ typedef enum
   LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_VALUE, /**< [[Values]] property */
   LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REMAINING_ELEMENT, /**< [[RemainingElement]] property */
   LIT_INTERNAL_MAGIC_STRING_ITERATOR_NEXT_INDEX, /**< [[%Iterator%NextIndex]] property */
+  LIT_INTERNAL_MAGIC_STRING_MAP_KEY, /**< Property key used when an object is a key in a map object */
   /* List of well known symbols */
   LIT_GLOBAL_SYMBOL_HAS_INSTANCE, /**< @@hasInstance well known symbol */
   LIT_GLOBAL_SYMBOL_IS_CONCAT_SPREADABLE, /**< @@isConcatSpreadable well known symbol */

jerry-core/lit/lit-magic-strings.inc.h

@@ -329,6 +329,7 @@ LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_COMPILE, "compile")
 LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_ENTRIES, "entries")
 #endif
 #if ENABLED (JERRY_BUILTIN_ARRAY) \
+|| ENABLED (JERRY_ES2015_BUILTIN_MAP) \
 || ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
 LIT_MAGIC_STRING_DEF (LIT_MAGIC_STRING_FOR_EACH_UL, "forEach")
 #endif