On OS X Catalina, running 'solve' in DifferentialEquations causes crash

It does work just fine on this build 1.6.0-DEV.306, without the VectorizationBase package. @Elrod mentions possible performance increases on the nightly build as well; I’m not sure how to check this, but if there’s something you want me to run just send me some code. Otherwise I’ll go ahead and remove this build, since 1.4 has been sorted.