Bug#701138: clang-3.2: fatal error: error in backend: Cannot select: 0x2a4c890: i32 = fabs 0x2a51390

[Ben Longbons]

In chroot:
Upgraded the otherwise-pure-sid to latest libc from experimental,
clang still builds correctly.
Upgraded libgcc1 and libstdc++ (which I believe are the only runtime
packages for gcc) likewise, clang still builds correctly.

I'm not sure what else to do now ...

I then reinstalled the "good" exp6 package out of chroot and get
(practically) the same error, except for fexp2 instead of fabs
(neither of which makes sense on integers nor should appear at all in
the program). Fortunately, I do have my chroot build, which works just
fine ...