[(new) Pass Manager] instantiate SimplifyCFG with the same options as the old PM

The old PM sets the options of what used to be known as "latesimplifycfg" on the 
instantiation after the vectorizers have run, so that's what we'redoing here.

FWIW, there's a later SimplifyCFGPass instantiation in both PMs where we do not 
set the "late" options. I'm not sure if that's intentional or not.

Differential Revision: https://reviews.llvm.org/D39407

llvm-svn: 316869