2b8b90a768
After r327219 was landed, the bot with expensive checks on GreenDragon started failing. The problem was missing symbols `regex_t` and `regmatch_t` in `xlocale/_regex.h`. The latter was included because after the change in r327219, `random` is needed, which transitively includes `xlocale.h.` which in turn conditionally includes `xlocale/_regex.h` when _REGEX_H_ is defined. Because this is the header guard in `regex_impl.h` and because `regex_impl.h` was included before the other LLVM includes, `xlocale/_regex.h` was included without the necessary types being available. This commit fixes this by moving the include of `regex_impl.h` all the way down. I also added a comment to stress the significance of its position. llvm-svn: 327256
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