Fix --hydrogen-stats crashing on null_ptr for shared_info

src/hydrogen.cc

 // Copyright 2013 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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast-numbering.h"
@@ skipping 13445 matching lines @@
 
 
 void HTracer::FlushToFile() {
   AppendChars(filename_.start(), trace_.ToCString().get(), trace_.length(),
               false);
   trace_.Reset();
 }
 
 
 void HStatistics::Initialize(CompilationInfo* info) {
-  if (info->shared_info().is_null()) return;
+  if (!info->has_shared_info()) return;
   source_size_ += info->shared_info()->SourceSize();
 }
 
 
 void HStatistics::Print() {
   PrintF(
       "\n"
       "----------------------------------------"
       "----------------------------------------\n"
       "--- Hydrogen timing results:\n"
@@ skipping 67 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8