[1.4>master] [MERGE #2090 @rajatd] Prevent redeferring a function body if GC happens while creating a function object of that function body
[1.4>master] [MERGE #2090 @rajatd] Prevent redeferring a function body if GC happens while creating a function object of that function body

Merge pull request #2090 from rajatd:redeferralFix

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