RISC-V: Add vwsll combine helpers.

RISC-V: Add vwsll combine helpers.

This patch enables the usage of vwsll in autovec context by adding the
necessary combine patterns and tests.

gcc/ChangeLog:

	* config/riscv/autovec-opt.md (*vwsll_zext1_<mode>): New
	pattern.
	(*vwsll_zext2_<mode>): Ditto.
	(*vwsll_zext1_scalar_<mode>): Ditto.
	(*vwsll_zext1_trunc_<mode>): Ditto.
	(*vwsll_zext2_trunc_<mode>): Ditto.
	(*vwsll_zext1_trunc_scalar_<mode>): Ditto.
	* config/riscv/vector-crypto.md: Make pattern similar to other
	narrowing/widening patterns.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/binop/vwsll-1.c: New test.
	* gcc.target/riscv/rvv/autovec/binop/vwsll-run.c: New test.
	* gcc.target/riscv/rvv/autovec/binop/vwsll-template.h: New test.