x86-64 tool chain works

[Arnd Bergmann <arnd@arndb.de>]

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I've found the bug in bochs that was stopping me from testing my
biarch tool chain and all the basic stuff seems to work fine now.
Anyone interested in an x86-64 debian port can now experiment
with the packages I have uploaded to http://www.arndb.de/debian/.

Just like on s390 and sparc, you should be able to install the 
biarch tool chain on a 32 bit machine without breaking native 
compiles. So far, I could test 64 bit binaries only in bochs,
but I don't expect them to break on a real hammer if anyone
has one.

There is a lot that can be done before the hardware is available,
so if there is enough interest, we should start a coordinated
effort soon.

	Arnd <><
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