Bugfix in hydrogen GVN.

BUG=chromium:467481
LOG=Y

Review URL: https://codereview.chromium.org/1009933002

Cr-Commit-Position: refs/heads/master@{#27223}

src/hydrogen.cc

@@ -6923,9 +6923,6 @@ HInstruction* HOptimizedGraphBuilder::BuildMonomorphicElementAccess(
     PropertyAccessType access_type,
     KeyedAccessStoreMode store_mode) {
   HCheckMaps* checked_object = Add<HCheckMaps>(object, map, dependency);
-  if (dependency) {
-    checked_object->ClearDependsOnFlag(kElementsKind);
-  }
 
   if (access_type == STORE && map->prototype()->IsJSObject()) {
     // monomorphic stores need a prototype chain check because shape

test/mjsunit/regress/regress-467481.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+function f(a1, a2) {
+  var v7 = a2[0];
+  var v8 = a1[0];
+  a2[0] = 0.3;
+}
+v6 = new Array(1);
+v6[0] = "tagged";
+f(v6, [1]);
+v5 = new Array(1);
+v5[0] = 0.1;
+f(v5, v5);
+v5 = new Array(10);
+f(v5, v5);
+%OptimizeFunctionOnNextCall(f);
+f(v5, v5);
+v5[0];