Avoid premature caching of baseClasses and superclass bits.
Avoid premature caching of baseClasses and superclass bits.

This can happen while classParents is set to Nil in Namer#classSig. Any call to baseClasses and superClassBits during that time needs to bypass the cache.

VladimirNik/dotty,VladimirNik/dotty,sjrd/dotty,yusuke2255/dotty,yusuke2255/dotty,vsalvis/dotty,sjrd/dotty,folone/dotty,som-snytt/dotty,som-snytt/dotty,lampepfl/dotty,folone/dotty,spetz911/dotty,sjrd/dotty,AlexSikia/dotty,auvik/dotty,som-snytt/dotty,DarkDimius/dotty,lampepfl/dotty,densh/dotty,svalaskevicius/dotty,spetz911/dotty,AlexSikia/dotty,dotty-staging/dotty,som-snytt/dotty,angi2/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,auvik/dotty,reactormonk/dotty,sjrd/dotty,dotty-staging/dotty,reactormonk/dotty,angi2/dotty,vsalvis/dotty,som-snytt/dotty,lampepfl/dotty,svalaskevicius/dotty,densh/dotty,dotty-staging/dotty,dotty-staging/dotty,sjrd/dotty