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Summary: These functions take and return wint_t, not int: http://pubs.opengroup.org/onlinepubs/9699919799/functions/towupper.html Reviewers: mclow.lists, EricWF Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D24743 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@281936 91177308-0d34-0410-b5e6-96231b3b80d8