[PATCH] Improved udivmodsi4 with support for ARMv4

[Tim Northover]

> How have you tested it? Have you benchmarked it against the previous implementation?

Cortex-A9 is probably the most important core without hardware
division. Well, M-class ones too, but I imagine those developers
wouldn't want this completely unrolled implementation in the first
place, with code size being so important.

Tim.