Optimize functions on a second thread.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index ef33dcb3c0b79493adc7e13941e20dc9d122b49b..c0618c8ea95dd76b7c83933febda75c99a2b639d 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -41,6 +41,7 @@
 #include "handles.h"
 #include "hashmap.h"
 #include "heap.h"
+#include "optimizing-compiler-thread.h"
 #include "regexp-stack.h"
 #include "runtime-profiler.h"
 #include "runtime.h"
@@ -1059,6 +1060,10 @@ class Isolate {
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
   void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
 
+  OptimizingCompilerThread* optimizing_compiler_thread() {
+    return &optimizing_compiler_thread_;
+  }
+
  private:
   Isolate();
 
@@ -1283,9 +1288,12 @@ class Isolate {
 #endif
 
   DeferredHandles* deferred_handles_head_;
+  OptimizingCompilerThread optimizing_compiler_thread_;
 
   friend class ExecutionAccess;
+  friend class HandleScopeImplementer;
   friend class IsolateInitializer;
+  friend class OptimizingCompilerThread;
   friend class ThreadManager;
   friend class Simulator;
   friend class StackGuard;