[1.8>master] [MERGE #4416 @Penguinwizzard] Remove now extraneous assert
[1.8>master] [MERGE #4416 @Penguinwizzard] Remove now extraneous assert

Merge pull request #4416 from Penguinwizzard:remove_extraneous_assert

The case that this assert was initially intended to guard against is
now properly handled.

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