Do not add values to HGraph in Lithium.

src/lithium.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 405 matching lines @@
 Representation LChunk::LookupLiteralRepresentation(
     LConstantOperand* operand) const {
   return graph_->LookupValue(operand->index())->representation();
 }
 
 
 LChunk* LChunk::NewChunk(HGraph* graph) {
   DisallowHandleAllocation no_handles;
   DisallowHeapAllocation no_gc;
   int values = graph->GetMaximumValueID();
+  graph->DisallowAddingNewValues();

[Toon Verwaest, 2013/11/08 13:32:21]

I'd swap the 2 lines above, just in the case someone decides to allocate HValues
in between those two lines.

   CompilationInfo* info = graph->info();
   if (values > LUnallocated::kMaxVirtualRegisters) {
     info->set_bailout_reason(kNotEnoughVirtualRegistersForValues);
     return NULL;
   }
   LAllocator allocator(values, graph);
   LChunkBuilder builder(info, graph, &allocator);
   LChunk* chunk = builder.Build();
   if (chunk == NULL) return NULL;
 
@@ skipping 63 matching lines @@
 
 
 LPhase::~LPhase() {
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceLithium(name(), chunk_);
   }
 }
 
 
 } }  // namespace v8::internal