[turbofan] Remove a redundant method call

R=mslekova@chromium.org

Bug: v8:7790
Change-Id: Ie6cc694ac3d11bdd454c2f6d23e24b4fdd59b00e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1822039Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63950}

src/compiler/serializer-for-background-compilation.cc

@@ -2708,7 +2708,7 @@ void SerializerForBackgroundCompilation::ProcessNamedPropertyAccess(
 void SerializerForBackgroundCompilation::ProcessNamedAccess(
     Hints receiver, NamedAccessFeedback const& feedback, AccessMode access_mode,
     Hints* new_accumulator_hints) {
-  for (Handle<Map> map : feedback.AsNamedAccess().maps()) {
+  for (Handle<Map> map : feedback.maps()) {
     MapRef map_ref(broker(), map);
     ProcessMapForNamedPropertyAccess(map_ref, feedback.name(), access_mode,
                                      base::nullopt, new_accumulator_hints);