node: un-revert 9a6012e

The crashes in debug mode after adding Locker are *not* caused by
Locker. Locker is merely exposing issues that already existed. Some of
these issues have since been fixed in 70635753.

This reverts commit 407181538b.
This reapplies commit 9a6012edd9.

Conflicts:
	src/node.cc

src/node.cc

@@ -2858,34 +2858,40 @@ int Start(int argc, char *argv[]) {
   // Use copy here as to not modify the original argv:
   Init(argc, argv_copy);
 
-  v8::V8::Initialize();
-  v8::HandleScope handle_scope;
+  V8::Initialize();
+  {
+    Locker locker;
+    HandleScope handle_scope;
 
-  // Create the one and only Context.
-  Persistent<v8::Context> context = v8::Context::New();
-  v8::Context::Scope context_scope(context);
+    // Create the one and only Context.
+    Persistent<Context> context = Context::New();
+    Context::Scope context_scope(context);
 
-  // Use original argv, as we're just copying values out of it.
-  Handle<Object> process_l = SetupProcessObject(argc, argv);
-  v8_typed_array::AttachBindings(context->Global());
+    // Use original argv, as we're just copying values out of it.
+    Handle<Object> process_l = SetupProcessObject(argc, argv);
+    v8_typed_array::AttachBindings(context->Global());
 
-  // Create all the objects, load modules, do everything.
-  // so your next reading stop should be node::Load()!
-  Load(process_l);
+    // Create all the objects, load modules, do everything.
+    // so your next reading stop should be node::Load()!
+    Load(process_l);
 
-  // All our arguments are loaded. We've evaluated all of the scripts. We
-  // might even have created TCP servers. Now we enter the main eventloop. If
-  // there are no watchers on the loop (except for the ones that were
-  // uv_unref'd) then this function exits. As long as there are active
-  // watchers, it blocks.
-  uv_run(uv_default_loop());
+    // All our arguments are loaded. We've evaluated all of the scripts. We
+    // might even have created TCP servers. Now we enter the main eventloop. If
+    // there are no watchers on the loop (except for the ones that were
+    // uv_unref'd) then this function exits. As long as there are active
+    // watchers, it blocks.
+    uv_run(uv_default_loop());
 
-  EmitExit(process_l);
-  RunAtExit();
+    EmitExit(process_l);
+    RunAtExit();
 
 #ifndef NDEBUG
-  // Clean up.
-  context.Dispose();
+    context.Dispose();
+#endif
+  }
+
+#ifndef NDEBUG
+  // Clean up. Not strictly necessary.
   V8::Dispose();
 #endif  // NDEBUG