[1.4>1.5] [MERGE #3092 @leirocks] fix handle leak for recycler concurrent thread
[1.4>1.5] [MERGE #3092 @leirocks] fix handle leak for recycler concurrent thread

Merge pull request #3092 from leirocks:handleleak

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