Add {Map,Set}::FromArray to the API

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index b1461f7cd87dd6d930851acc3eb813ebe52a5476..0e7e14a33fb46c44235d7f4d411bb699c7ea7ed6 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -186,6 +186,8 @@ enum BindingFlags {
   V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map)                       \
   V(JS_MAP_MAP_INDEX, Map, js_map_map)                                         \
   V(JS_SET_MAP_INDEX, Map, js_set_map)                                         \
+  V(MAP_FROM_ARRAY_INDEX, JSFunction, map_from_array)                          \
+  V(SET_FROM_ARRAY_INDEX, JSFunction, set_from_array)                          \
   V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map)                             \
   V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map)                             \
   V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator)            \
@@ -426,6 +428,8 @@ class Context: public FixedArray {
     ITERATOR_RESULT_MAP_INDEX,
     JS_MAP_MAP_INDEX,
     JS_SET_MAP_INDEX,
+    MAP_FROM_ARRAY_INDEX,
+    SET_FROM_ARRAY_INDEX,
     MAP_ITERATOR_MAP_INDEX,
     SET_ITERATOR_MAP_INDEX,
     ARRAY_VALUES_ITERATOR_INDEX,