[LLVMdev] Win32 COFF Support

[Nathan Jeffords]

I cleaned up my code a bit, and integrated into the LLVM sources. While this
code works for my purposes, it needs a bit more work before its
generally useful.

Two aspects I think will cause the most trouble are not having support for
uninitialized data sections, and common symbols. Uninitialized data sections
should be relatively simple to add, but its not clear to me how common
symbols should be implemented.

For normal symbols, I assume they are contained within the current section.
>From what I understand, COFF common symbols must be in their own section. It
can't tell if it is guaranteed that MCStreamer::SwitchSection will be called
after the emission of a common symbol thus giving the exporter
an opportunity to switch back to the section for normal symbols. On the
other hand, there is a section pointer associated with the symbol, if this
is reliable, what is the need for MCStreamer::SwitchSection, is it (or
should it be) possible to emit data or code not tied to a symbol?

- Nathan
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