(i386-linux x sh-elf) build breakage

[Joern Rennecke]

> The best fix may be to expand into multiple jumps during initial rtl
> generation.  Since this code was written I enhanced the expr.c routines
> to be able to handle multiple jumps from the bcc expanders to handle
> something similar to this from the new x86 backend.

cse and the loop optimizer wouldn't understand these branches.  I think it
would be better to allow splits that generate new basic blocks.