[bug-mes] tests and uldiv on mes wip-arm

[Danny Milosavljevic]

Hi,

I'm in the process of fixing some of the remaining failing tests on ARM and
found those:

FAIL: lib/tests/scaffold/23-pointer-sub.c [uldiv]
FAIL: lib/tests/scaffold/36-compare-arithmetic.c [uldiv] [legitimate]

I have a few questions:

* How should div.o have been included?  It doesn't seem to be included, hence 
uldiv could not be resolved.
* The first one is dividing by 1.  Should we detect that in the compiler and 
optimize it away?

Also, a LOT of the other failing tests segfault.  It would be nice to have a 
program in mes that finds out where that is in the C source (if the debug info 
is good enough for that).

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