Make number of available threads isolate-dependent and expose it to ResourceConstraints.

src/hydrogen.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 2754 matching lines @@
 
 HBasicBlock* HGraph::CreateBasicBlock() {
   HBasicBlock* result = new(zone()) HBasicBlock(this);
   blocks_.Add(result, zone());
   return result;
 }
 
 
 void HGraph::FinalizeUniqueness() {
   DisallowHeapAllocation no_gc;
-  ASSERT(!isolate()->optimizing_compiler_thread()->IsOptimizerThread());
+  ASSERT(!OptimizingCompilerThread::IsOptimizerThread(isolate()));
   for (int i = 0; i < blocks()->length(); ++i) {
     for (HInstructionIterator it(blocks()->at(i)); !it.Done(); it.Advance()) {
       it.Current()->FinalizeUniqueness();
     }
   }
 }
 
 
 // Block ordering was implemented with two mutually recursive methods,
 // HGraph::Postorder and HGraph::PostorderLoopBlocks.
@@ skipping 7337 matching lines @@
   } else {
     CodeStub::Major major_key = info->code_stub()->MajorKey();
     PrintStringProperty("name", CodeStub::MajorName(major_key, false));
     PrintStringProperty("method", "stub");
   }
   PrintLongProperty("date", static_cast<int64_t>(OS::TimeCurrentMillis()));
 }
 
 
 void HTracer::TraceLithium(const char* name, LChunk* chunk) {
-  ASSERT(!FLAG_concurrent_recompilation);
+  ASSERT(!chunk->isolate()->concurrent_recompilation_enabled());
   AllowHandleDereference allow_deref;
   AllowDeferredHandleDereference allow_deferred_deref;
   Trace(name, chunk->graph(), chunk);
 }
 
 
 void HTracer::TraceHydrogen(const char* name, HGraph* graph) {
-  ASSERT(!FLAG_concurrent_recompilation);
+  ASSERT(!graph->isolate()->concurrent_recompilation_enabled());
   AllowHandleDereference allow_deref;
   AllowDeferredHandleDereference allow_deferred_deref;
   Trace(name, graph, NULL);
 }
 
 
 void HTracer::Trace(const char* name, HGraph* graph, LChunk* chunk) {
   Tag tag(this, "cfg");
   PrintStringProperty("name", name);
   const ZoneList<HBasicBlock*>* blocks = graph->blocks();
@@ skipping 266 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal