[libc++] Declare <compare> operators with the proper visibility attribute Summary: Many operators in <compare> were _defined_ with the proper visibility attribute, but they were _declared_ without any. This is not a problem until we change the definition of _LIBCPP_INLINE_VISIBILITY to something that requires the declaration to be decorated. I also marked `strong_equality::operator weak_equality()` as `_LIBCPP_INLINE_VISIBILITY`, since it seems like it had been forgotten. This came up while trying to get rid of `__attribute__((__always_inline__))` in favor of `__attribute__((internal_linkage))`. Reviewers: EricWF, mclow.lists Subscribers: christof, dexonsmith, llvm-commits Differential Revision: https://reviews.llvm.org/D49104 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@336665 91177308-0d34-0410-b5e6-96231b3b80d8
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