[PATCH] Add a Scalarize pass

[Renato Golin]

  Hi Pekka,

  The number of tests seem good, but it is enabled by default on the PassManagerBuilder, and that's not a good thing.

  I think what you need here is to enable that as a command-line option (opt, later clang, etc), use opt to test the pass, and let specific front-ends enable them by deafult if they so wish, in their private implementations.

http://llvm-reviews.chandlerc.com/D2112