rs6000: Delete old add+cmp patterns

rs6000: Delete old add+cmp patterns

There are some patterns that recognise the parallel of an add and a
compare, and split it back to the same two insns.  This apparently
helped RIOS machines before RTL scheduling existed?  Either way, it
isn't helpful anymore, and even hurts a tiny bit.  So, delete it.

	* config/rs6000/rs6000.md (two unnamed define_insn and define_split):
	Delete.

From-SVN: r263604