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[libitm] Port to ARM

To get the ball rolling for other targets, and to let port maintainers see how easy it really is, here's a first cut at a port to ARM.

Only cross-compiled as yet, and qemu-linux-user isn't good enough to emulate.  I'll do another build on the armv7 host once my current bootstrap and test for the atomic optabs is complete.

Please review, especially the local setjmp-alike implementation.


r~

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