Optimize functions on a second thread.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 9d79db246675b30890448be4f2df0a8b128b77d4..958fe190cff5393806da93aa53d07cdc0dae781a 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -772,22 +772,30 @@ DisallowAllocationFailure::~DisallowAllocationFailure() {
 
 #ifdef DEBUG
 AssertNoAllocation::AssertNoAllocation() {
-  old_state_ = HEAP->allow_allocation(false);
+  Isolate* isolate = ISOLATE;
+  active_ = !isolate->optimizing_compiler_thread()->IsOptimizerThread();
+  if (active_) {
+    old_state_ = isolate->heap()->allow_allocation(false);
+  }
 }
 
 
 AssertNoAllocation::~AssertNoAllocation() {
-  HEAP->allow_allocation(old_state_);
+  if (active_) HEAP->allow_allocation(old_state_);
 }
 
 
 DisableAssertNoAllocation::DisableAssertNoAllocation() {
-  old_state_ = HEAP->allow_allocation(true);
+  Isolate* isolate = ISOLATE;
+  active_ = !isolate->optimizing_compiler_thread()->IsOptimizerThread();
+  if (active_) {
+    old_state_ = isolate->heap()->allow_allocation(true);
+  }
 }
 
 
 DisableAssertNoAllocation::~DisableAssertNoAllocation() {
-  HEAP->allow_allocation(old_state_);
+  if (active_) HEAP->allow_allocation(old_state_);
 }
 
 #else