847c8520b1
For imports of constants across DLLs to work on Windows it *requires* that the import be marked with `dllimport` (unlike functions where the marker is optional, but strongly recommended). This currently isn't working for importing FFI constants across boundaries, however, so the one constant exported from `rustc_llvm.dll` is now a function to be called instead.
This directory currently contains some LLVM support code. This will generally be sent upstream to LLVM in time; for now it lives here.