Fix uninitialized variable compiler errors [GCC 4.8.4]

src/runtime/runtime-object.cc

 // Copyright 2014 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.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/messages.h"
@@ skipping 43 matching lines @@
                                                Handle<Object> object,
                                                Handle<Object> key) {
   if (object->IsUndefined() || object->IsNull()) {
     THROW_NEW_ERROR(
         isolate,
         NewTypeError(MessageTemplate::kNonObjectPropertyLoad, key, object),
         Object);
   }
 
   // Check if the given key is an array index.
-  uint32_t index;
+  uint32_t index = 0;
   if (key->ToArrayIndex(&index)) {
     return GetElementOrCharAt(isolate, object, index);
   }
 
   // Convert the key to a name - possibly by calling back into JavaScript.
   Handle<Name> name;
   ASSIGN_RETURN_ON_EXCEPTION(isolate, name, ToName(isolate, key), Object);
 
   // Check if the name is trivially convertible to an index and get
   // the element if so.
@@ skipping 24 matching lines @@
     } else {
       ASSIGN_RETURN_ON_EXCEPTION(isolate, name_object,
                                  Execution::ToString(isolate, key), Object);
     }
     Handle<Name> name = Handle<Name>::cast(name_object);
     return Object::SetProperty(Handle<JSProxy>::cast(object), name, value,
                                language_mode);
   }
 
   // Check if the given key is an array index.
-  uint32_t index;
+  uint32_t index = 0;
   if (key->ToArrayIndex(&index)) {
     // TODO(verwaest): Support non-JSObject receivers.
     if (!object->IsJSObject()) return value;
     Handle<JSObject> js_object = Handle<JSObject>::cast(object);
 
     // In Firefox/SpiderMonkey, Safari and Opera you can access the characters
     // of a string using [] notation.  We need to support this too in
     // JavaScript.
     // In the case of a String object we just need to redirect the assignment to
     // the underlying string if the index is in range.  Since the underlying
@@ skipping 55 matching lines @@
   return Object::SetProperty(object, name, value, language_mode);
 }
 
 
 MaybeHandle<Object> Runtime::DefineObjectProperty(Handle<JSObject> js_object,
                                                   Handle<Object> key,
                                                   Handle<Object> value,
                                                   PropertyAttributes attrs) {
   Isolate* isolate = js_object->GetIsolate();
   // Check if the given key is an array index.
-  uint32_t index;
+  uint32_t index = 0;
   if (key->ToArrayIndex(&index)) {
     // In Firefox/SpiderMonkey, Safari and Opera you can access the characters
     // of a string using [] notation.  We need to support this too in
     // JavaScript.
     // In the case of a String object we just need to redirect the assignment to
     // the underlying string if the index is in range.  Since the underlying
     // string does nothing with the assignment then we can ignore such
     // assignments.
     if (js_object->IsStringObjectWithCharacterAt(index)) {
       return value;
@@ skipping 1346 matching lines @@
   CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
 
   RETURN_FAILURE_ON_EXCEPTION(
       isolate,
       JSObject::DefineAccessor(object, name, isolate->factory()->null_value(),
                                setter, attrs));
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8