[committed] Fix assembly scan for RISC-V VLS tests

[committed] Fix assembly scan for RISC-V VLS tests

Surya's IRA patch from June slightly improves the code we generate for the
vls/calling-conventions tests on RISC-V.  Specifically it removes an
unnecessary move from the instruction stream.  This (of course) broke those
tests:

> Running /home/jlaw/test/gcc/gcc/testsuite/gcc.target/riscv/rvv/rvv.exp ...
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-1.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-2.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-3.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-4.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-5.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-6.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3
> FAIL: gcc.target/riscv/rvv/autovec/vls/calling-convention-7.c -O3 -ftree-vectorize -mrvv-vector-bits=scalable  scan-assembler-times mv\\s+s0,a0\\s+call\\s+memset\\s+mv\\s+a0,s0 3

This patch does the natural adjustment of those tests by dropping the moves
from the scan.

gcc/testsuite
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-1.c: Update
	expected output.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-2.c: Likewise.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-3.c: Likewise.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-4.c: Likewise.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-5.c: Likewise.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-6.c: Likewise.
	* gcc.target/riscv/rvv/autovec/vls/calling-convention-7.c: Likewise.