spu.md ("div<mode>3"): Convert into expander, move original insn and splitter content...

spu.md ("div<mode>3"): Convert into expander, move original insn and splitter contents into ...

	* config/spu/spu.md ("div<mode>3"): Convert into expander, move
	original insn and splitter contents into ...
	("*div<mode>3_fast"): ... this new pattern.  Enable only if
	flag_unsafe_math_optimizations.  Add dummy scratch register.
	("*div<mode>3_adjusted"): New insn and splitter.  Enable only if
	!flag_unsafe_math_optimizations.  Returns number with next
	highest magnitude if this is still less or equal to the true
	quotient in magnitude.

From-SVN: r138036