deps: patch V8 to 7.0.276.25

PR-URL: #23290
Refs: v8/v8@7.0.276.24...7.0.276.25
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 7
 #define V8_MINOR_VERSION 0
 #define V8_BUILD_NUMBER 276
-#define V8_PATCH_LEVEL 24
+#define V8_PATCH_LEVEL 25
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/compiler/js-operator.cc

@@ -623,7 +623,7 @@ CompareOperationHint CompareOperationHintOf(const Operator* op) {
   V(CreateKeyValueArray, Operator::kEliminatable, 2, 1)                \
   V(CreatePromise, Operator::kEliminatable, 0, 1)                      \
   V(CreateTypedArray, Operator::kNoProperties, 5, 1)                   \
-  V(CreateObject, Operator::kNoWrite, 1, 1)                            \
+  V(CreateObject, Operator::kNoProperties, 1, 1)                       \
   V(ObjectIsArray, Operator::kNoProperties, 1, 1)                      \
   V(HasProperty, Operator::kNoProperties, 2, 1)                        \
   V(HasInPrototypeChain, Operator::kNoProperties, 2, 1)                \

deps/v8/test/mjsunit/compiler/regress-888923.js

@@ -0,0 +1,31 @@
+// Copyright 2018 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() {
+  function f(o) {
+    o.x;
+    Object.create(o);
+    return o.y.a;
+  }
+
+  f({ x : 0, y : { a : 1 } });
+  f({ x : 0, y : { a : 2 } });
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(3, f({ x : 0, y : { a : 3 } }));
+})();
+
+(function() {
+  function f(o) {
+    let a = o.y;
+    Object.create(o);
+    return o.x + a;
+  }
+
+  f({ x : 42, y : 21 });
+  f({ x : 42, y : 21 });
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(63, f({ x : 42, y : 21 }));
+})();