Added failing test.

Author: DanielRosenwasser

tests/cases/conformance/es6/for-ofStatements/for-of58.ts

@@ -0,0 +1,12 @@
+//@target: ES5
+
+var array = [1,2,3];
+var sum = 0;
+
+for (let num of array) {
+    if (sum === 0) {
+        array = [4,5,6]
+    }
+    
+    sum += num;
+}