[heap] Use smaller minimum allocation limit growing step when optimizing for memory usage.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index f39b89393346a148abac7c9283f09f695311ad41..e15c1f37e77dfa3dd43b61ed0c2125e93c871c7c 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -519,9 +519,6 @@ class Heap {
   };
   typedef List<Chunk> Reservation;
 
-  static const intptr_t kMinimumOldGenerationAllocationLimit =
-      8 * (Page::kPageSize > MB ? Page::kPageSize : MB);
-
   static const int kInitalOldGenerationLimitFactor = 2;
 
 #if V8_OS_ANDROID
@@ -1803,6 +1800,15 @@ class Heap {
   void SetOldGenerationAllocationLimit(intptr_t old_gen_size, double gc_speed,
                                        double mutator_speed);
 
+  intptr_t MinimumAllocationLimitGrowingStep() {
+    const double kRegularAllocationLimitGrowingStep = 8;
+    const double kLowMemoryAllocationLimitGrowingStep = 2;
+    intptr_t limit = (Page::kPageSize > MB ? Page::kPageSize : MB);
+    return limit * (ShouldOptimizeForMemoryUsage()
+                        ? kLowMemoryAllocationLimitGrowingStep
+                        : kRegularAllocationLimitGrowingStep);
+  }
+
   // ===========================================================================
   // Idle notification. ========================================================
   // ===========================================================================