[cleanup] Remove some obsolete TODOs.

R=sigurds@chromium.org

Bug: v8:7570
Change-Id: I3f077940117467be98fbb3c2a30684af8eaaf801
Reviewed-on: https://chromium-review.googlesource.com/1032432
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52837}

src/d8.js

@@ -42,8 +42,7 @@ function Stringify(x, depth) {
     case "string":
       return "\"" + x.toString() + "\"";
     case "bigint":
-      // TODO(neis): Use x.toString() once we have it.
-      return String(x) + "n";
+      return x.toString() + "n";
     case "object":
       if (IS_NULL(x)) return "null";
       if (x.constructor && x.constructor.name === "Array") {

src/objects.cc

@@ -6934,7 +6934,6 @@ Maybe<bool> JSReceiver::DefineOwnProperty(Isolate* isolate,
     return JSTypedArray::DefineOwnProperty(
         isolate, Handle<JSTypedArray>::cast(object), key, desc, should_throw);
   }
-  // TODO(neis): Special case for JSModuleNamespace?
 
   // OrdinaryDefineOwnProperty, by virtue of calling
   // DefineOwnPropertyIgnoreAttributes, can handle arguments

src/prototype.h

@@ -137,7 +137,6 @@ class PrototypeIterator {
   }
 
   // Returns false iff a call to JSProxy::GetPrototype throws.
-  // TODO(neis): This should probably replace Advance().
   V8_WARN_UNUSED_RESULT bool AdvanceFollowingProxies() {
     DCHECK(!(handle_.is_null() && object_->IsJSProxy()));
     if (!HasAccess()) {

test/mjsunit/es6/reflect.js

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(neis): Test with proxies.
-
 
 
 ////////////////////////////////////////////////////////////////////////////////