RISC-V/testsuite: Fix several zvfh tests.

RISC-V/testsuite: Fix several zvfh tests.

This fixes some zvfh test oversights as well as adds zfh to the target
requirements.  It's not strictly necessary to have zfh but it greatly
simplifies test handling when we can just calculate the reference value
instead of working around it.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/binop/fmax_zvfh-1.c: Adjust.
	* gcc.target/riscv/rvv/autovec/binop/fmax_zvfh_run-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/fmin_zvfh-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/binop/fmin_zvfh_run-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-1.h:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-2.h:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-rv32-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-rv32-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-rv64-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int-rv64-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_run-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_run-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_int2float_run-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_int2float_run-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax_zvfh_run-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax_zvfh_run-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax_zvfh_run-3.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmax_zvfh_run-4.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin_zvfh_run-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin_zvfh_run-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin_zvfh_run-3.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_fmin_zvfh_run-4.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt_run-zvfh-1.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_sqrt_run-zvfh-2.c:
	Ditto.
	* gcc.target/riscv/rvv/autovec/reduc/reduc_zvfh-10.c: Ditto.
	* gcc.target/riscv/rvv/autovec/reduc/reduc_zvfh_run-10.c: Ditto.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-1.h: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-2.h: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-rv32-1.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-rv32-2.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-rv64-1.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh-rv64-2.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh_run-1.c: New test.
	* gcc.target/riscv/rvv/autovec/cond/cond_convert_float2int_zvfh_run-2.c: New test.