Patch to fix gcse multiple set handling

[John Wehle]

> Perhaps that's right, but perhaps not.  Can you send me the .i file in
> question?

I'll need to set things up again.  I believe the abort happens when
attempting to compiling libstdc++-v3/misc-inst.cc.  You might want
to simply try compiling --target=arm-elf using newlib (that's all I'm
doing).

I'll send you the .ii file in a little bit when I have it.

-- John
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