Fix GCC 4.7 (C++11) compilation.

src/profile-generator.cc

 // Copyright 2012 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
@@ skipping 3588 matching lines @@
 
 void HeapSnapshotJSONSerializer::SerializeSnapshot() {
   writer_->AddString("\"title\":\"");
   writer_->AddString(snapshot_->title());
   writer_->AddString("\"");
   writer_->AddString(",\"uid\":");
   writer_->AddNumber(snapshot_->uid());
   writer_->AddString(",\"meta\":");
   // The object describing node serialization layout.
   // We use a set of macros to improve readability.
-#define JSON_A(s) "["s"]"
-#define JSON_O(s) "{"s"}"
-#define JSON_S(s) "\""s"\""
+#define JSON_A(s) "[" s "]"
+#define JSON_O(s) "{" s "}"
+#define JSON_S(s) "\"" s "\""
   writer_->AddString(JSON_O(
     JSON_S("node_fields") ":" JSON_A(
         JSON_S("type") ","
         JSON_S("name") ","
         JSON_S("id") ","
         JSON_S("self_size") ","
         JSON_S("retained_size") ","
         JSON_S("dominator") ","
         JSON_S("edges_index")) ","
     JSON_S("node_types") ":" JSON_A(
@@ skipping 126 matching lines @@
 
 
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))
     sorted_entries->Add(p);
   sorted_entries->Sort(SortUsingEntryValue);
 }
 
 } }  // namespace v8::internal