[MERGE #4614 @jackhorton] Fix error messages on errors created through the JSRT
[MERGE #4614 @jackhorton] Fix error messages on errors created through the JSRT

Merge pull request #4614 from jackhorton:jsrt_error_message

This will unblock the 01/14/18 node merge pump

Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore