Improve performance for large printer_blacklist entries
#518
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Regular expressions were compiled on the fly for every entry in
printer_blacklistevery time a new node needed to see if its symbol was blacklisted.This dramatically speeds up expression printing when there are more than a few entries in
printer_blacklist, which prior to this change jumped from a total of ~20 seconds to several minutes when wrapping a large API (and after this change is back to ~20 seconds for this specific case).