Fix bogus deopt in BuildEmitDeepCopy for holey arrays.

R=verwaest@chromium.org
BUG=chromium:242924
TEST=mjsunit/regress/regress-crbug-242924

Review URL: https://codereview.chromium.org/15735012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14757 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -11012,9 +11012,11 @@ void HOptimizedGraphBuilder::BuildEmitDeepCopy(
             AddInstruction(new(zone) HConstant(i, Representation::Integer32()));
         HInstruction* value_instruction =
             AddInstruction(new(zone) HLoadKeyed(
-                boilerplate_elements, key_constant, NULL, kind));
-        AddInstruction(new(zone) HStoreKeyed(
+                boilerplate_elements, key_constant, NULL, kind,
+                ALLOW_RETURN_HOLE));
+        HInstruction* store = AddInstruction(new(zone) HStoreKeyed(
                 object_elements, key_constant, value_instruction, kind));
+        store->ClearFlag(HValue::kDeoptimizeOnUndefined);
       }
     } else if (elements->IsFixedArray()) {
       Handle<FixedArray> fast_elements = Handle<FixedArray>::cast(elements);
@@ -11037,7 +11039,8 @@ void HOptimizedGraphBuilder::BuildEmitDeepCopy(
         } else {
           HInstruction* value_instruction =
               AddInstruction(new(zone) HLoadKeyed(
-                  boilerplate_elements, key_constant, NULL, kind));
+                  boilerplate_elements, key_constant, NULL, kind,
+                  ALLOW_RETURN_HOLE));
           AddInstruction(new(zone) HStoreKeyed(
               object_elements, key_constant, value_instruction, kind));
         }

test/mjsunit/regress/regress-crbug-242924.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax --expose-gc --gc-global
+
+function f() {
+  return [,{}];
+}
+
+assertEquals([,{}], f());
+assertEquals([,{}], f());
+%OptimizeFunctionOnNextCall(f);
+assertEquals([,{}], f());
+gc();
+
+function g() {
+  return [[,1.5],{}];
+}
+
+assertEquals([[,1.5],{}], g());
+assertEquals([[,1.5],{}], g());
+%OptimizeFunctionOnNextCall(g);
+assertEquals([[,1.5],{}], g());
+gc();