[cleanup] Remove obsolete comment.

The introduction of the FeedbackVector solved the problem of
inconsistent feedback between ICs in unoptimized and optimized
code.

Bug: v8:2029, v8:9183
Tbr: jkummerow@chromium.org
Change-Id: Id61033c1661e5a2efb740988552de76f7f148d0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1649566Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62065}

src/ic/ic.cc

@@ -368,9 +368,6 @@ void IC::OnFeedbackChanged(Isolate* isolate, FeedbackVector vector,
 #endif
 
   isolate->runtime_profiler()->NotifyICChanged();
-  // TODO(2029): When an optimized function is patched, it would
-  // be nice to propagate the corresponding type information to its
-  // unoptimized version for the benefit of later inlining.
 }
 
 static bool MigrateDeprecated(Handle<Object> object) {