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

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 983586071574641910207e932ec88206ed414a84..c4748a11908c5914a341099718da3911f2f8cbe2 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -21151,6 +21151,9 @@ TEST(Map) {
   CHECK_EQ(2, entry->Length());
   CHECK_EQ(3, entry->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(4, entry->Get(1).As<v8::Int32>()->Value());
+
+  map = v8::Map::FromArray(env.local(), entries).ToLocalChecked();
+  CHECK_EQ(2, map->Size());
 }
 
 
@@ -21173,4 +21176,7 @@ TEST(Set) {
   CHECK_EQ(2, keys->Length());
   CHECK_EQ(1, keys->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(2, keys->Get(1).As<v8::Int32>()->Value());
+
+  set = v8::Set::FromArray(env.local(), keys).ToLocalChecked();
+  CHECK_EQ(2, set->Size());
 }