[1.4>master] [MERGE #2164 @pleath] Trivial deserialization fix
[1.4>master] [MERGE #2164 @pleath] Trivial deserialization fix

Merge pull request #2164 from pleath:9773675

Check for deferred deserialized function before trying to access ParseableFunctionInfo in byte code gen.

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