RISC-V: Add conditional sqrt autovec pattern

RISC-V: Add conditional sqrt autovec pattern

This patch adds a combined pattern for combining vfsqrt.v and vcond_mask.

gcc/ChangeLog:

	* config/riscv/autovec-opt.md (*cond_<optab><mode>):
	Add sqrt + vcond_mask combine pattern.
	* config/riscv/autovec.md (<optab><mode>2):
	Change define_expand to define_insn_and_split.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt-1.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt-2.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt_run-1.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt_run-2.c: New test.