8139047: add test for JSAdapter __getIds__
Reviewed-by: hannesw, sundar
truefalseCustomError at <program> (test/script/basic/JDK-8062583.js:40)test/script/basic/JDK-8062583.js:40:4 CustomErrorCustomError at <program> (test/script/basic/JDK-8062583.js:49)test/script/basic/JDK-8062583.js:49 CustomError