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24258c4417
this patch adds the <compare> header and implements all of it except for [comp.alg]. As I understand it, the header is needed by the compiler in when implementing the semantics of operator<=>. For that reason I feel it's important to land this header early, despite all compilers lacking support. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@329460 91177308-0d34-0410-b5e6-96231b3b80d8