[TurboFan] Don't run child serializer if inlining is turned off

TurboFan serializes the callee functions when concurrent inlining is
turned on. However, if inlining itself is turned off (for ex: TurboProp)
we don't need to serialize these functions reducing time spent on
main thread.

Bug: v8:9684
Change-Id: If4aba1deb64188e411d4f82b27c475ea93a15344
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1932375Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65157}

src/compiler/pipeline.cc

@@ -1431,6 +1431,9 @@ struct SerializationPhase {
       flags |=
           SerializerForBackgroundCompilationFlag::kAnalyzeEnvironmentLiveness;
     }
+    if (data->info()->is_inlining_enabled()) {
+      flags |= SerializerForBackgroundCompilationFlag::kEnableTurboInlining;
+    }
     RunSerializerForBackgroundCompilation(
         data->zone_stats(), data->broker(), data->dependencies(),
         data->info()->closure(), flags, data->info()->osr_offset());

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

@@ -1969,7 +1969,9 @@ void SerializerForBackgroundCompilation::ProcessCalleeForCallOrConstruct(
     ProcessBuiltinCall(shared, new_target, arguments, speculation_mode, padding,
                        result_hints);
     DCHECK_NE(shared->GetInlineability(), SharedFunctionInfo::kIsInlineable);
-  } else if (shared->GetInlineability() == SharedFunctionInfo::kIsInlineable &&
+  } else if ((flags() &
+              SerializerForBackgroundCompilationFlag::kEnableTurboInlining) &&
+             shared->GetInlineability() == SharedFunctionInfo::kIsInlineable &&
              callee.HasFeedbackVector()) {
     CompilationSubject subject =
         callee.ToCompilationSubject(broker()->isolate(), zone());

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

@@ -23,6 +23,7 @@ enum class SerializerForBackgroundCompilationFlag : uint8_t {
   kBailoutOnUninitialized = 1 << 0,
   kCollectSourcePositions = 1 << 1,
   kAnalyzeEnvironmentLiveness = 1 << 2,
+  kEnableTurboInlining = 1 << 3,
 };
 using SerializerForBackgroundCompilationFlags =
     base::Flags<SerializerForBackgroundCompilationFlag>;