This header was included after the implementations to work around an
issue with FreeBSD, however, , this causes some issues when
dllexport\explicit visibility
attributes will be added to the headers on Windows, since the
definitions need to see the declarations for the attributes to apply.
This is part of the work to enable LLVM_BUILD_LLVM_DYLIB and plugins on
windows.
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Co-authored-by: Tom Stellard <tstellar@redhat.com>