Replace `test_32` and `test_16` closure with a common function

[Alignof]

Currently, test_32 and test_16 closure are placed each unit test module.

raki/src/decode/base_i.rs

Lines 349 to 361 in 754a26e

	let test_32 = |inst_32: u32,
	op: OpcodeKind,
	rd: Option<usize>,
	rs1: Option<usize>,
	rs2: Option<usize>,
	imm: Option<i32>| {
	let op_32 = inst_32.parse_opcode(Isa::Rv64).unwrap();
	assert!(matches!(&op_32, op));
	assert_eq!(inst_32.parse_rd(&op_32).unwrap(), rd);
	assert_eq!(inst_32.parse_rs1(&op_32).unwrap(), rs1);
	assert_eq!(inst_32.parse_rs2(&op_32).unwrap(), rs2);
	assert_eq!(inst_32.parse_imm(&op_32, Isa::Rv64).unwrap(), imm);
	};

It should be replaced with a common function and add more information.