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Just a dummy directory and a few sane choices in the Darwin SDK. rdar://problem/18575597 llvm-svn: 219323
It is often convenient to be able to build compiler-rt libraries for a certain platform without having a full SDK or development environment installed. This makes it easy for users to build a compiler which can target a number of different platforms, without having to actively maintain full development environments for those platforms. Since compiler-rt's libraries typically have minimal interaction with the system, we achieve this by stubbing out the SDKs of certain platforms.