Merging r155287:

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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.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_31@155378 91177308-0d34-0410-b5e6-96231b3b80d8