Bring back "[PM] Port JumpThreading to the new PM" with a fix

This reverts commit r272603 and adds a fix.

Big thanks to Davide for pointing me at r216244 which gives some insight
into how to fix this VS2013 issue. VS2013 can't synthesize a move
constructor. So the fix here is to add one explicitly to the
JumpThreadingPass class.

llvm-svn: 272607