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Visual C++ 14 and newer split msvcrt into msvcrt and ucrt with flavours of the ucrt for different environments. This changed the access to the ctype table by introducing the `__pctype_func` and `__pwctype_func` accessors. Use this rather than directly accessing `_ctype` which allows us to be safer in threaded situations by going through the libc locking. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290823 91177308-0d34-0410-b5e6-96231b3b80d8