[PATCH] Allow dllimport/dllexport on inline functions and get the linkage right

[Yunzhong Gao]

> Reid pointed out that we would get the linkage wrong for exported functions in C99 mode, and that the reasonable thing to do would be to use MS semantics dllimport/export inline functions. I'll update the patch to do this.

@rnk. If I recall correctly, Microsoft does not support C99 inline. What does MinGw(64) do in this case?

http://reviews.llvm.org/D3772