Improve sparc setcc generation and add testcases.

Improve sparc setcc generation and add testcases.

gcc/

	* config/sparc/sparc.c (emit_scc_insn): Do not try v9 sequences until
	LEU/LTU/GEU/GTU is attempted.
	* config/sparc/sparc.md (*neg_snesi_sign_extend): New 64-bit insn
	and split.
	(*neg_seqsi_sign_extend): Likewise.
	(*sltu_extend_sp64, *neg_sltu_extend_sp64, *sgeu_extend_sp64,
	*neg_sgeu_extend_sp64): New insns.

gcc/testsuite/

	* gcc.target/sparc/setcc-1.c: New test.
	* gcc.target/sparc/setcc-2.c: New test.

From-SVN: r180550