Fix PR target/109140

Fix PR target/109140

This is a regression present on the mainline and 12 branch at -O2, but the
issue is related to vectorization so was present at -O3 in earlier versions.

The vcondu expander that was added for VIS 3 more than a decade ago does not
fully work, because it does not filter out the unsigned condition codes (the
instruction is an UNSPEC that accepts only signed condition codes).

While I was at it, I also added the missing vcond and vcondu expanders for
the new comparison instructions that were added in VIS 4.

gcc/
	PR target/109140
	* config/sparc/sparc.cc (sparc_expand_vcond): Call signed_condition
	on operand #3 to get the final condition code.  Use std::swap.
	* config/sparc/sparc.md (vcondv8qiv8qi): New VIS 4 expander.
	(fucmp<gcond:code>8<P:mode>_vis): Move around.
	(fpcmpu<gcond:code><GCM:gcm_name><P:mode>_vis): Likewise.
	(vcondu<GCM:mode><GCM:mode>): New VIS 4 expander.

gcc/testsuite/
	* gcc.target/sparc/20230328-1.c: New test.
	* gcc.target/sparc/20230328-2.c: Likewise.
	* gcc.target/sparc/20230328-3.c: Likewise.
	* gcc.target/sparc/20230328-4.c: Likewise.