Patch to build 64 bit VM

[Xiaobin Lu]

I cut the wrong line from the other patch when I generated the attached 
patch. The first line should be:

diff -r de4c58dbee8f src/cpu/x86/vm/stubGenerator_x86_64.cpp

Sorry for confusion.
-Xiaobin

Xiaobin Lu wrote:
> I am attaching the patch for building 64 bit VM. They are BSD specific 
> files.  Would someone review it and help me check it in?
>
> Thanks,
> -Xiaobin
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