Bring PTX back to sync with release tarball

llvm-svn: 172478

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SVN tag also included these previous commits:

Author: Pawel Wodnicki <pawel@32bitmicro.com>
Date: Fri Jan 11 15:15:08 2013 +0000

    removing PTX remnants
    
    llvm-svn: 172206

Author: Tobias Grosser <grosser@fim.uni-passau.de>
Date: Thu Dec 27 10:59:28 2012 +0000

    Create Polly 3.2 release tag
    
    llvm-svn: 171156

Author: Pawel Wodnicki <pawel@32bitmicro.com>
Date: Thu Dec 20 17:58:57 2012 +0000

    Fixing the Clang's 3.2  final release notes.
    
    llvm-svn: 170710

Author: Pawel Wodnicki <pawel@32bitmicro.com>
Date: Wed Dec 19 17:10:52 2012 +0000

    Creating release candidate final from release_32 branch
    
    llvm-svn: 170562
    llvm-svn: 170559
    llvm-svn: 170558