[api] Add an ApiCheck for Function::Call on a null handle

This would help separate such API misuses from other Invoke() crashes
which indicate crashes in generated code.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I6c596fb63950d7306fab1b689dd913a61764d257
Reviewed-on: https://chromium-review.googlesource.com/825942Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50092}

src/api.cc

@@ -5407,6 +5407,8 @@ MaybeLocal<v8::Value> Function::Call(Local<Context> context,
            InternalEscapableScope);
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   auto self = Utils::OpenHandle(this);
+  Utils::ApiCheck(!self.is_null(), "v8::Function::Call",
+                  "Function to be called is a null pointer");
   i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
   STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Object**));
   i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);