[turbofan] Fix computation for V8.TurboFanOptimizeTotalForeground

Fixing the computation of the foreground time after original CL:
https://chromium-review.googlesource.com/c/v8/v8/+/1547864/

Bug: v8:7790, v8:9074
Change-Id: Ic6af4f17aa6e30f9810bd36b0e9f7151ccb57538
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559737
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60697}

src/compiler.cc

@@ -301,7 +301,7 @@ void OptimizedCompilationJob::RecordCompilationStats(CompilationMode mode,
       // Compute foreground / background time.
       base::TimeDelta time_background;
       base::TimeDelta time_foreground =
-          time_taken_to_prepare_ + time_taken_to_execute_;
+          time_taken_to_prepare_ + time_taken_to_finalize_;
       switch (mode) {
         case OptimizedCompilationJob::kConcurrent:
           time_background += time_taken_to_execute_;