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

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 15b56b24ba7ebaeb24e55bb97c5628aa63546566..7806f0af2016a87988833493bb3a0a2b63e58da3 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -60,6 +60,7 @@ Heap::Heap()
 // Will be 4 * reserved_semispace_size_ to ensure that young
 // generation can be aligned to its size.
       maximum_committed_(0),
+      old_space_growing_factor_(4),
       survived_since_last_expansion_(0),
       sweep_generation_(0),
       always_allocate_scope_depth_(0),
@@ -5025,6 +5026,12 @@ bool Heap::ConfigureHeap(int max_semi_space_size,
 
   code_range_size_ = code_range_size * MB;
 
+  // We set the old generation growing factor to 2 to grow the heap slower on
+  // memory-constrained devices.
+  if (max_old_generation_size_ <= kMaxOldSpaceSizeMediumMemoryDevice) {
+    old_space_growing_factor_ = 2;
+  }
+
   configured_ = true;
   return true;
 }