Avoid Context::Enter and Context::Exit if we're reentering the active and last entered context

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index cb6658082206e529c84f701a0835ca63122ad3fc..ec538cc6e9f1c434415a5e7e94746369c05ffe7a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -182,7 +182,17 @@ class CallDepthScope {
     DCHECK(!isolate_->external_caught_exception());
     isolate_->IncrementJsCallsFromApiCounter();
     isolate_->handle_scope_implementer()->IncrementCallDepth();
-    if (!context_.IsEmpty()) context_->Enter();
+    if (!context.IsEmpty()) {
+      i::Handle<i::Context> env = Utils::OpenHandle(*context);
+      i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
+      if (isolate->context() != nullptr &&
+          isolate->context()->native_context() == env->native_context() &&
+          impl->LastEnteredContextWas(env)) {
+        context_ = Local<Context>();
+      } else {
+        context_->Enter();
+      }
+    }
     if (do_callback_) isolate_->FireBeforeCallEnteredCallback();
   }
   ~CallDepthScope() {