RISC-V: Fix compress shuffle pattern [PR117383].

RISC-V: Fix compress shuffle pattern [PR117383].

This patch makes vcompress use the tail-undisturbed policy by default
and also uses the proper VL.

	PR target/117383

gcc/ChangeLog:

	* config/riscv/riscv-protos.h (enum insn_type): Use TU policy.
	* config/riscv/riscv-v.cc (shuffle_compress_patterns): Set VL.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/binop/vcompress-avlprop-1.c:
	Expect tu.
	* gcc.target/riscv/rvv/autovec/pr117383.c: New test.