Remove BasicConstraintManager.  It hasn't been in active service for a while.

As part of this change, I discovered that a few of our tests were not testing
the RangeConstraintManager.  Luckily all of those passed when I moved them
over to use that constraint manager.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162384 91177308-0d34-0410-b5e6-96231b3b80d8
30 files changed