Memop fix related to scanning for missing values

Author: rajatd

lib/Runtime/Library/JavascriptArray.inl

@@ -892,7 +892,7 @@ SECOND_PASS:
                         else if (!HasNoMissingValues())
                         {
                             // Have we overwritten all the missing values?
-                            if (!ScanForMissingValues<T>(0, startOffset))
+                            if (!ScanForMissingValues<T>(0, startOffset) && !ScanForMissingValues<T>(startOffset + length, current->length))
                             {
                                 SetHasNoMissingValues();
                             }

test/Array/memop_missingValues.js

@@ -0,0 +1,26 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
+function test0()
+{
+  var GiantPrintArray = [];
+  var IntArr0 = new Array(1, 1);
+  var FloatArr0 = [];
+  FloatArr0[1] = 1;
+  FloatArr0[0] = 1;
+  FloatArr0[12] = 1;
+  var v5;
+  v5 = IntArr0.length;
+  for (var i = 0; i < v5; i++) {
+    FloatArr0[i] = IntArr0[i];
+  }
+  GiantPrintArray.push(FloatArr0);
+  for (var v2 = 0; 0 < GiantPrintArray; 0) {
+  }
+}
+test0();
+test0();
+test0();
+print("passed");

test/Array/rlexe.xml

@@ -714,6 +714,12 @@
       <compile-flags>-mic:1 -off:simplejit -mmoc:0</compile-flags>
     </default>
   </test>
+  <test>
+    <default>
+      <files>memop_missingValues.js</files>
+      <compile-flags>-mmoc:0</compile-flags>
+    </default>
+  </test>
   <test>
     <default>
       <files>bug4587739.js</files>