[libc] Introduce asctime, asctime_r to LLVM libc asctime and asctime_r share the same common code. They call asctime_internal a static inline function. asctime uses snprintf to return the string representation in a buffer. It uses the following format (26 characters is the buffer size) as per 7.27.3.1 section in http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2478.pdf. The buf parameter for asctime_r shall point to a buffer of at least 26 bytes. snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",...) Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D99686
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