Revert of [heap] Simplify heuristics for incremental step size.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index c7adefc4f1978972475075a5091882d285528bbb..e0d20a032fb87bf97848b38402246b36529d9685 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1677,6 +1677,10 @@
   // Flush the number to string cache.
   void FlushNumberStringCache();
 
+  // TODO(hpayer): Allocation site pretenuring may make this method obsolete.
+  // Re-visit incremental marking heuristics.
+  bool IsHighSurvivalRate() { return high_survival_rate_period_length_ > 0; }
+
   void ConfigureInitialOldGenerationSize();
 
   bool HasLowYoungGenerationAllocationRate();