[MERGE #2685 @Cellule] WASM: Fix memory leak when tracing wasm reader
[MERGE #2685 @Cellule] WASM: Fix memory leak when tracing wasm reader

Merge pull request #2685 from Cellule:users/micfer/wasm/traceleak

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