clang/ARM regression

[Oleksandr Tymoshenko]

Hi,

There seems to be some kind of regression in recently imported clang on ARM.
Beaglebone kernel built using clang  with WITNESS enabled panics
on boot. If I change optimization flags from -O to -O0 it works fine.
I'm trying to isolate test case but it panics fairly early in boot process
so it's not easy. If somebody tracks clang development and aware of
known issues that might cause it - please share.

So far I tried fix from this bug but it didn't help:
http://llvm.org/bugs/show_bug.cgi?id=15581