[MERGE #2526 @pleath] Protect ParseableFunctionInfo::Finalize from accessing an uninitialized FunctionInfo field.
[MERGE #2526 @pleath] Protect ParseableFunctionInfo::Finalize from accessing an uninitialized FunctionInfo field.

Merge pull request #2526 from pleath:9937193

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