Make assertion scopes thread safe.

src/hydrogen-gvn.cc

 // Copyright 2013 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 350 matching lines @@
 }
 
 
 HGlobalValueNumberer::HGlobalValueNumberer(HGraph* graph, CompilationInfo* info)
       : graph_(graph),
         info_(info),
         removed_side_effects_(false),
         block_side_effects_(graph->blocks()->length(), graph->zone()),
         loop_side_effects_(graph->blocks()->length(), graph->zone()),
         visited_on_paths_(graph->zone(), graph->blocks()->length()) {
-#ifdef DEBUG
-    ASSERT(info->isolate()->optimizing_compiler_thread()->IsOptimizerThread() ||
-           !info->isolate()->heap()->IsAllocationAllowed());
-#endif
+    ASSERT(!AllowHandleAllocation::IsAllowed());
     block_side_effects_.AddBlock(GVNFlagSet(), graph_->blocks()->length(),
                                  graph_->zone());
     loop_side_effects_.AddBlock(GVNFlagSet(), graph_->blocks()->length(),
                                 graph_->zone());
   }
 
 bool HGlobalValueNumberer::Analyze() {
   removed_side_effects_ = false;
   ComputeBlockSideEffects();
   if (FLAG_loop_invariant_code_motion) {
@@ skipping 464 matching lines @@
                                                       dominated);
         successor_map->Kill(side_effects_on_all_paths);
         successor_dominators->Kill(side_effects_on_all_paths);
       }
     }
     current = next;
   }
 }
 
 } }  // namespace v8::internal