SH: declare fpul_operands

[Joern Rennecke]

> Any preference among the existing ones?  Or should it be a new header
> file?  Or should we just standardize the common practice of declaring
> the predicates in <mach>-protos.h and stop emitting the declarations
> in insn-output.c?

No particular preference.
Maybe it's simplest to make a new one, to be generated by genoutput istead
of putting the stuff into insn-output.c .
The new header file can then be added to CONFIG_H in Makefile.in