Tune evacuation candidate selection.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index d161b1853d8afb662193e416dfa471380f93164b..4876d0814c1025c2e46498f3abeb2954e1257b6d 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -702,8 +702,7 @@ void MarkCompactCollector::CollectEvacuationCandidates(PagedSpace* space) {
   int candidate_count = 0;
   int total_live_bytes = 0;
 
-  bool reduce_memory =
-      heap()->ShouldReduceMemory() || heap()->HasLowAllocationRate();
+  bool reduce_memory = heap()->ShouldReduceMemory();
   if (FLAG_manual_evacuation_candidates_selection) {
     for (size_t i = 0; i < pages.size(); i++) {
       Page* p = pages[i].second;