clang/AST/Decl.h: Add "raw_ostream.h" to appease msvc.
clang/AST/Decl.h: Add "raw_ostream.h" to appease msvc.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@175952 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang