8156615: Catch parameter can be a BindingPattern in ES6 modeSummary: Added parser support for catch parameter being a binding patternReviewed-by: sundar, hannesw, attilaContributed-by: srinivas.dama@oracle.com
8156619: Unimplemented ES6 features should result in clear Error being thrownReviewed-by: sundar, attila