Run Crankshaft on a separate thread.

src/v8threads.cc

Index: src/v8threads.cc
diff --git a/src/v8threads.cc b/src/v8threads.cc
index fd8d5364011cdee45c196cd58550fa31313cb9d7..25d7b90f78b693ae8f3285d9d2c176bb8806cf68 100644
--- a/src/v8threads.cc
+++ b/src/v8threads.cc
@@ -103,7 +103,7 @@ Locker::~Locker() {
   ASSERT(isolate_->thread_manager()->IsLockedByCurrentThread());
   if (has_lock_) {
     if (isolate_->IsDefaultIsolate()) {
-      isolate_->Exit();
+      isolate_->Exit(false);
     }
     if (top_level_) {
       isolate_->thread_manager()->FreeThreadResources();
@@ -122,7 +122,9 @@ Unlocker::Unlocker(v8::Isolate* isolate)
   }
   ASSERT(isolate_->thread_manager()->IsLockedByCurrentThread());
   if (isolate_->IsDefaultIsolate()) {
-    isolate_->Exit();
+    // Small hack to make sure ArchiveThread does not see an unlocked
+    // view of the isolate.
+    isolate_->Exit(false);
   }
   isolate_->thread_manager()->ArchiveThread();
   isolate_->thread_manager()->Unlock();
@@ -210,6 +212,7 @@ bool ThreadManager::RestoreThread() {
 
 
 void ThreadManager::Lock() {
+  ASSERT(!IsLockedByCurrentThread());
   mutex_->Lock();
   mutex_owner_ = ThreadId::Current();
   ASSERT(IsLockedByCurrentThread());
@@ -217,6 +220,7 @@ void ThreadManager::Lock() {
 
 
 void ThreadManager::Unlock() {
+  ASSERT(IsLockedByCurrentThread());
   mutex_owner_ = ThreadId::Invalid();
   mutex_->Unlock();
 }