Merge branch 'master' into harmony-v3.0.20

test/input/invalid/for-in_1.js

@@ -0,0 +1,4 @@
+var a, b = [1, 2];
+for (1, 2, a in b) {
+    console.log(a, b[a]);
+}

test/input/invalid/for-in_2.js

@@ -0,0 +1,4 @@
+var c = [1, 2];
+for (var a, b in c) {
+    console.log(a, c[a]);
+}