[profiler] Add extra CHECK to track down crbug.com/665398

src/profiler/profile-generator.cc

 // Copyright 2012 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/profiler/profile-generator.h"
 
 #include "src/base/adapters.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/global-handles.h"
@@ skipping 406 matching lines @@
       top_down_.pending_nodes_count() >= kNodesFlushCount) {
     StreamPendingTraceEvents();
   }
 }
 
 namespace {
 
 void BuildNodeValue(const ProfileNode* node, TracedValue* value) {
   const CodeEntry* entry = node->entry();
   value->BeginDictionary("callFrame");
+// TODO(alph): Extra check to help catch crbug.com/665398
+// Remove before 5.8 branch
+#if V8_MAJOR_VERSION == 5 && V8_MINOR_VERSION == 7
+  CHECK(entry->name());
+#endif
   value->SetString("functionName", entry->name());
   if (*entry->resource_name()) {
     value->SetString("url", entry->resource_name());
   }
   value->SetInteger("scriptId", entry->script_id());
   if (entry->line_number()) {
     value->SetInteger("lineNumber", entry->line_number() - 1);
   }
   if (entry->column_number()) {
     value->SetInteger("columnNumber", entry->column_number() - 1);
@@ skipping 330 matching lines @@
     case EXTERNAL:
       return CodeEntry::program_entry();
     case IDLE:
       return CodeEntry::idle_entry();
     default: return NULL;
   }
 }
 
 }  // namespace internal
 }  // namespace v8