RISC-V: Fix incorrect VTYPE fusion for floating point scalar move insn[PR111037]

RISC-V: Fix incorrect VTYPE fusion for floating point scalar move insn[PR111037]

void foo(_Float16 y, int64_t *i64p)
{
  vint64m1_t vx =__riscv_vle64_v_i64m1 (i64p, 1);
  vx = __riscv_vadd_vv_i64m1 (vx, vx, 1);
  vfloat16m1_t vy =__riscv_vfmv_s_f_f16m1 (y, 1);
  asm volatile ("# use %0 %1" : : "vr"(vx), "vr" (vy));
}

zve64f:
foo:
	vsetivli	zero,1,e16,mf4,ta,ma
	vle64.v	v1,0(a0)
	vfmv.s.f	v2,fa0
	vsetvli	zero,zero,e64,m1,ta,ma
	vadd.vv	v1,v1,v1

zve64d:
foo:
	vsetivli	zero,1,e64,m1,ta,ma
	vle64.v	v1,0(a0)
	vfmv.s.f	v2,fa0
	vadd.vv	v1,v1,v1

gcc/ChangeLog:

	PR target/111037
	* config/riscv/riscv-vsetvl.cc (float_insn_valid_sew_p): New function.
	(second_sew_less_than_first_sew_p): Fix bug.
	(first_sew_less_than_second_sew_p): Ditto.

gcc/testsuite/ChangeLog:

	PR target/111037
	* gcc.target/riscv/rvv/base/pr111037-1.c: New test.
	* gcc.target/riscv/rvv/base/pr111037-2.c: New test.

(cherry picked from commit 29547511f7bae06f9f424f8c8583014878240016)