RISC-V: Fix double mode under RV32 not utilize vf

Currently, some binops of vector vs double scalar under RV32 can't
translated to vf but vfmv+vxx.vv.

The cause is that vec_duplicate is also expanded to broadcast for double mode
under RV32. last-combine can't process expanded broadcast.

gcc/ChangeLog:

	* config/riscv/vector.md: Add !FLOAT_MODE_P constraint.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/binop/vadd-rv32gcv-nofm.c: Fix test.
	* gcc.target/riscv/rvv/autovec/binop/vdiv-rv32gcv-nofm.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vmul-rv32gcv-nofm.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/vsub-rv32gcv-nofm.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_copysign-rv32gcv.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fadd-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fadd-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fadd-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fadd-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fma_fnma-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fma_fnma-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fma_fnma-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fma_fnma-5.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fma_fnma-6.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fms_fnms-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fms_fnms-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fms_fnms-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fms_fnms-5.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fms_fnms-6.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmul-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmul-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmul-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmul-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmul-5.c: Ditto.