[1.2>master] [MERGE #921] MemCopy btree array source not long enough
[1.2>master] [MERGE #921] MemCopy btree array source not long enough

Merge pull request #921 from Cellule:memcopy/btree
When doing a memcopy with a btree, bailout if we fail to get the value of the source array (source not long enough)

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