Make assertion scopes thread safe.

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 401 matching lines @@
 }
 
 
 Representation LChunk::LookupLiteralRepresentation(
     LConstantOperand* operand) const {
   return graph_->LookupValue(operand->index())->representation();
 }
 
 
 LChunk* LChunk::NewChunk(HGraph* graph) {
-  NoHandleAllocation no_handles(graph->isolate());
-  AssertNoAllocation no_gc;
-
+  DisallowHandleAllocation no_handles;
+  DisallowHeapAllocation no_gc;
   int values = graph->GetMaximumValueID();
   CompilationInfo* info = graph->info();
   if (values > LUnallocated::kMaxVirtualRegisters) {
     info->set_bailout_reason("not enough virtual registers for values");
     return NULL;
   }
   LAllocator allocator(values, graph);
   LChunkBuilder builder(info, graph, &allocator);
   LChunk* chunk = builder.Build();
   if (chunk == NULL) return NULL;
@@ skipping 51 matching lines @@
       } else {
         spill_slot_count_++;
       }
     }
     iterator.Advance();
   }
 }
 
 
 } }  // namespace v8::internal