Merging r155287:

------------------------------------------------------------------------
r155287 | chapuni | 2012-04-21 08:31:45 -0700 (Sat, 21 Apr 2012) | 3 lines

llvm/lib/Target: [PR12611] Add "llvm/Support/raw_ostream.h" for Debug build on MSVC.

Thanks to Andy Gibbs, to report the issue.
------------------------------------------------------------------------

llvm-svn: 155378