deps: patch V8 to 7.0.276.36

Refs: v8/v8@7.0.276.35...7.0.276.36

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 35
+#define V8_PATCH_LEVEL 36
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/objects.cc

@@ -10266,15 +10266,22 @@ Handle<DescriptorArray> DescriptorArray::CopyForFastObjectClone(
     Name* key = src->GetKey(i);
     PropertyDetails details = src->GetDetails(i);
 
-    SLOW_DCHECK(!key->IsPrivateField() && details.IsEnumerable() &&
-                details.kind() == kData);
+    DCHECK(!key->IsPrivateField());
+    DCHECK(details.IsEnumerable());
+    DCHECK_EQ(details.kind(), kData);
 
     // Ensure the ObjectClone property details are NONE, and that all source
     // details did not contain DONT_ENUM.
     PropertyDetails new_details(kData, NONE, details.location(),
                                 details.constness(), details.representation(),
                                 details.field_index());
-    descriptors->Set(i, key, src->GetValue(i), new_details);
+    // Do not propagate the field type of normal object fields from the
+    // original descriptors since FieldType changes don't create new maps.
+    MaybeObject* type = src->GetValue(i);
+    if (details.location() == PropertyLocation::kField) {
+      type = MaybeObject::FromObject(FieldType::Any());
+    }
+    descriptors->Set(i, key, type, new_details);
   }
 
   descriptors->Sort();

deps/v8/test/mjsunit/regress/regress-crbug-881247.js

@@ -0,0 +1,24 @@
+// 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
+
+const resolvedPromise = Promise.resolve();
+
+function spread() {
+  const result = { ...resolvedPromise };
+  %HeapObjectVerify(result);
+  return result;
+}
+
+resolvedPromise[undefined] =  {a:1};
+%HeapObjectVerify(resolvedPromise);
+
+spread();
+
+resolvedPromise[undefined] = undefined;
+%HeapObjectVerify(resolvedPromise);
+
+spread();
+%HeapObjectVerify(resolvedPromise);