cgen: fix == for mut arraay args (#5648)

vlib/builtin/array_test.v

@@ -877,3 +877,24 @@ fn test_plus_assign_string() {
 	a[0] += 'abc'
 	assert a == ['abc']
 }
+
+fn mut_arr_with_eq_in_fn(mut a []int) {
+	if a == [1,2,3,4] {
+		a[0] = 0
+	}
+	if [0,2,3,4] == a {
+		a[1] = 0	
+	}
+	if !(a != [0,0,3,4]) {
+		a[2] = 0	
+	}
+	if !([0,0,0,4] != a) {
+		a[3] = 0
+	}
+}
+
+fn test_mut_arr_with_eq_in_fn() {
+	mut a := [1,2,3,4]
+	mut_arr_with_eq_in_fn(mut a)
+	assert a == [0,0,0,0]
+}

vlib/v/gen/cgen.v

@@ -1879,8 +1879,14 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		} else if node.op == .ne {
 			g.write('!${ptr_typ}_arr_eq(')
 		}
+	    if node.left_type.is_ptr() {
+			g.write('*')
+		}
 		g.expr(node.left)
 		g.write(', ')
+		if node.right_type.is_ptr() {
+			g.write('*')
+		}
 		g.expr(node.right)
 		g.write(')')
 	} else if node.op in [.key_in, .not_in] {
@@ -2814,7 +2820,7 @@ fn (mut g Gen) assoc(node ast.Assoc) {
 fn (mut g Gen) gen_array_equality_fn(left table.Type) string {
 	left_sym := g.table.get_type_symbol(left)
 	typ_name := g.typ(left)
-	ptr_typ := typ_name[typ_name.index_after('_', 0) + 1..]
+	ptr_typ := typ_name[typ_name.index_after('_', 0) + 1..].trim('*')
 	elem_sym := g.table.get_type_symbol(left_sym.array_info().elem_type)
 	elem_typ := g.typ(left_sym.array_info().elem_type)
 	ptr_elem_typ := elem_typ[elem_typ.index_after('_', 0) + 1..]