[PATCH] Make GNUInline consistent with whether we use traditional GNU inline semantics.

[Richard Smith]

`__GNUC_STDC_INLINE__` means C99 inline semantics, which is just as wrong as `__GNUC_GNU_INLINE__` for C++. We have to make a choice between these two to support glibc, and sticking to what g++ does (and what clang previously did) seems like the clear better choice -- the risk of breaking things by making a change here is high, and I don't see that there's any real benefit to changing which lie we tell the user.


http://reviews.llvm.org/D9333

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