cgen: simplify fixed arr return

[felipensp]

Fix #18377

struct Test {}

fn (t Test) conversion_error(value u16) [4]u8 {
	return conversion_error(value)
}

fn conversion_error(value u16) [4]u8 {
	mut return_value := [4]u8{}
	for i := 0; i < 4; i++ {
		return_value[i] = u8(value)
	}
	return return_value
}


fn main() {
	// -- Block below works fine
	value := conversion_error(42)
	println(value)

	value2 := Test{}.conversion_error(42)
	println(value)
	// -- Block above works fine
	println(conversion_error(42))
	println(Test{}.conversion_error(42))

	y := dump(conversion_error(42))
	dump(y)

	y2 := dump(Test{}.conversion_error(42))
	dump(y2)

	a := [1,2]!
	assert dump(a) == [1,2]!
}

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