RISC-V: Fix ICE of RVV compare intrinsic

RISC-V: Fix ICE of RVV compare intrinsic

vfrsub_vf_m.cpp: In function 'int main()':
vfrsub_vf_m.cpp:5:43: error: invalid argument to built-in function
   5 |   vbool32_t d = __riscv_vmflt_vf_f32m1_b32(c, b, 8);
     |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
during RTL pass: expand
vfrsub_vf_m.cpp:5:43: internal compiler error: Segmentation fault
0x19f1b89 crash_signal
       ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/toplev.cc:314
0x1472e2f store_expr(tree_node*, rtx_def*, int, bool, bool)
       ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/expr.cc:6348

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins.cc
	(function_expander::use_compare_insn): Add operand predicate check.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/bug-1.c: New test.