[1.7>master] [1.6>1.7] [MERGE #3866 @Penguinwizzard] Re-enable RecyclerChecker runs
[1.7>master] [1.6>1.7] [MERGE #3866 @Penguinwizzard] Re-enable RecyclerChecker runs

Merge pull request #3866 from Penguinwizzard:reenable_swb_check

I disabled this because doing so worked around widespread CI failures
(due to the lack of libclang-dev on the new images). This commit does
the opposite and re-enables it, for when the package is available.

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