[PATCH] EABI Divmod, take #1

[Renato Golin]

Hi all,

The attached patch implements __eabi_*divmod calls when on EABI mode only.
It also allows for the contraction of div+mod and uses the correct ABI of
using R1, not the stack as in the GNU variant.

This patch does not test for 64-bit values correctness, yet, nor the use of
divmod for calculating only the remainder, which shall go on separate
patch(es). FIXMEs in place.

The test-suite buildbot is unaffected because it runs on
arm-linux-gnueabihf, not arm-none-eabi.

Please review.

cheers,
--renato
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