unwind info for darwin

[Andreas Tobler]

Attached a patch which adds unwind info to the libffi darwin part.
Running with this patch the libgcj failures will be reduced by about 20.
The patch has been tested on both, 3.3 and trunk.

Could one take over the ci as I don't have cvs access? In case of the 
patch being accepted.

Thanks,

Andreas

more fix ups will follow.

2003-01-20  Andreas Tobler  <a.tobler@schweiz.ch>

	* src/powerpc/darwin.S: Add unwind info.
	* src/powerpc/darwin_closure.S: Likewise.


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