[PATCH 1/8] or1k: Callee-saved registers for permanent data (with attachment)

[Stefan Wallentowitz]

During interrupt handling the PICSR, table pointers and current
interrupt line have been saved in incorrect registers and/or stored on
the stack.

Save the pointer in r16/r18, PICSR in r20 and the current interrupt
line in r22. Those are callee-saved registers, so that the register
values will be preserved.

libgloss/Changelog:
    * or1k/interruts-asm.S: Change registers to callee-saved

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