[PATCH] Revert Thumb-2 conversion of ARM builtins.

[Tim Northover]

Hi Stephen,


> The umodsi3 code computes jump targets based on ARM encodings (if CLZ is
> present and IDIV is not present).

Reverting everything seems a little extreme if only a few functions
are computing jumps like this. Can't we be a bit more targeted?

Cheers.

Tim.