RISC-V/testsuite: Add branchless cases for GEU and LEU cond-move operations

RISC-V/testsuite: Add branchless cases for GEU and LEU cond-move operations

Verify, for Ventana and Zicond targets and the GEU and LEU
conditional-move operations, that if-conversion triggers via
`noce_try_cmove' at `-mbranch-cost=4' setting, which makes branchless
code sequences produced by if-conversion cheaper than their original
branched equivalents, and that extraneous instructions such as SEQZ,
etc. are not present in output.

	gcc/testsuite/
	* gcc.target/riscv/movdigtu-ventana.c: New test.
	* gcc.target/riscv/movdigtu-zicond.c: New test.
	* gcc.target/riscv/movdiltu-ventana.c: New test.
	* gcc.target/riscv/movdiltu-zicond.c: New test.
	* gcc.target/riscv/movsigtu-ventana.c: New test.
	* gcc.target/riscv/movsigtu-zicond.c: New test.
	* gcc.target/riscv/movsiltu-ventana.c: New test.
	* gcc.target/riscv/movsiltu-zicond.c: New test.