* Add support for DataStructure analysis

* Parameterize pass outputting with the printPass template, so analysis
  output can optionally take more arguments than just a stream.  The
  default output mode is just to use operator<< on the analysis.
* Remove CurrentModule hack, in favor of using printPass
* Remove special operator<<'s defined for FindUsedTypes and
  FindUnsafePointerTypes, in favor of printPass specializations
* Use std::cout instead of cout

llvm-svn: 1995