Revert "Grow big old generation slower.", tanks SplayHarder.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 63a05c73e49988c5aee31b8ad4447373219cc3a7..523dd81aa0811d0b3945bfa2d55bc651c4aef166 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1074,23 +1074,9 @@ class Heap {
       700 * kPointerMultiplier;
 
   intptr_t OldGenerationAllocationLimit(intptr_t old_gen_size) {
-    intptr_t limit;
-    if (FLAG_stress_compaction) {
-      limit = old_gen_size + old_gen_size / 10;
-    } else if (old_gen_size < max_old_generation_size_ / 8) {
-      if (max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice) {
-        limit = old_gen_size * 2;
-      } else {
-        limit = old_gen_size * 4;
-      }
-    } else if (old_gen_size < max_old_generation_size_ / 4) {
-      limit = static_cast<intptr_t>(old_gen_size * 1.5);
-    } else if (old_gen_size < max_old_generation_size_ / 2) {
-      limit = static_cast<intptr_t>(old_gen_size * 1.2);
-    } else {
-      limit = static_cast<intptr_t>(old_gen_size * 1.1);
-    }
-
+    intptr_t limit = FLAG_stress_compaction
+        ? old_gen_size + old_gen_size / 10
+        : old_gen_size * old_space_growing_factor_;
     limit = Max(limit, kMinimumOldGenerationAllocationLimit);
     limit += new_space_.Capacity();
     intptr_t halfway_to_the_max = (old_gen_size + max_old_generation_size_) / 2;
@@ -1515,6 +1501,11 @@ class Heap {
   intptr_t max_executable_size_;
   intptr_t maximum_committed_;
 
+  // The old space growing factor is used in the old space heap growing
+  // strategy. The new old space size is the current old space size times
+  // old_space_growing_factor_.
+  int old_space_growing_factor_;
+
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
   int survived_since_last_expansion_;