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

[Peter Collingbourne]

We always define one of `__GNUC_GNU_INLINE__` or `__GNUC_STDC_INLINE__` depending on whether `GNUInline` is set; see lib/Frontend/InitPreprocessor.cpp lines 793-796. So I don't think this would break.


http://reviews.llvm.org/D9333

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