[PATCH] [RISC-V] Fix shift type for RVV interleaved stepped patterns [PR120356]

It corrects the shift type of interleaved stepped patterns for const vector
expanding in LRA. The shift instruction was initially LSHIFTRT, and it seems
still should be the same type for both LRA and other cases.

	PR target/120356

gcc/ChangeLog:

	* config/riscv/riscv-v.cc
	(expand_const_vector_interleaved_stepped_npatterns):
	Fix ASHIFT to LSHIFTRT insn.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/pr120356.c: New test.

(cherry picked from commit 9c1ed63e4c6b0f80dd47ce421dd7d80d52c38fd3)
2 files changed