[ppc64] newer gcc breaks kernel build?

[Kyle McMartin]

- fix ppc/ppc64 -mmultiple and out of line gpr/fpr saving bugs
  (#519409, PR target/40677, PR target/41175)

My guess is this has broken the kernel build on powerpc64:
init/built-in.o: In function `arch_disable_smp_support':
/builddir/build/BUILD/kernel-2.6.31/linux-2.6.31.ppc64/init/main.c:139: undefined reference to `._savegpr0_31'
/builddir/build/BUILD/kernel-2.6.31/linux-2.6.31.ppc64/init/main.c:139: undefined reference to `._restgpr0_31'

by generating calls to out of line handlers, which are only supplied for
PPC32 in arch/powerpc/lib/.

Any thoughts? If it's not this, it must have been something hitting rawhide
between:
2009-09-16 22:06:38	and
2009-09-17 15:25:47

cheers, Kyle