[PM] Enable the new simple loop unswitch pass in the new pass manager
(where it is the only realistic option).

This passes the LLVM test suite for me, but I'm clearly still hammering
on this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303952 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed