cgen: fix shared array.last() (#15379)

vlib/v/gen/c/fn.v

@@ -1009,7 +1009,7 @@ fn (mut g Gen) method_call(node ast.CallExpr) {
 			if !node.left.is_lvalue() {
 				g.write('ADDR($rec_cc_type, ')
 				has_cast = true
-			} else {
+			} else if node.name !in ['first', 'last', 'repeat'] {
 				g.write('&')
 			}
 		}

vlib/v/tests/shared_array_last_test.v

@@ -0,0 +1,13 @@
+module main
+
+fn test_shared_array_last() {
+	shared a := []int{}
+	lock  {
+		a << 1
+		a << 2
+	}
+	rlock a {
+		println(a.last())
+		assert a.last() == 2
+	}
+}