[Polly] Remove the PoCC and ScopLib support

  Remove the PoCC and ScopLib support from Polly as we do not have a
  user/maintainer for it.

Differential Revision: http://reviews.llvm.org/D4871



git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@215563 91177308-0d34-0410-b5e6-96231b3b80d8