Fix cctest/test-unboxed-doubles/IncrementalWriteBarrierObjectShiftFieldsRight after 5e87a0.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 660 matching lines @@
     pages.push_back(std::make_pair(live_bytes, p));
   }
 
   int candidate_count = 0;
   int total_live_bytes = 0;
 
   bool reduce_memory =
       reduce_memory_footprint_ ||
       heap()->HasLowAllocationRate(
           heap()->tracer()->CurrentAllocationThroughputInBytesPerMillisecond());
-
-  if (FLAG_stress_compaction || FLAG_manual_evacuation_candidates_selection) {
+  if (FLAG_manual_evacuation_candidates_selection) {
     for (size_t i = 0; i < pages.size(); i++) {
       Page* p = pages[i].second;
-      if (((i % 2 == 0) && FLAG_stress_compaction) ||
-          p->IsFlagSet(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING)) {
+      if (p->IsFlagSet(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING)) {
         candidate_count++;
         total_live_bytes += pages[i].first;
         p->ClearFlag(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING);
         AddEvacuationCandidate(p);
       }
     }
+  } else if (FLAG_stress_compaction) {
+    for (size_t i = 0; i < pages.size(); i++) {
+      Page* p = pages[i].second;
+      if (i % 2 == 0) {
+        candidate_count++;
+        total_live_bytes += pages[i].first;
+        AddEvacuationCandidate(p);
+      }
+    }
   } else {
     const int kTargetFragmentationPercent = 50;
     const int kMaxEvacuatedBytes = 4 * Page::kPageSize;
 
     const int kTargetFragmentationPercentForReduceMemory = 20;
     const int kMaxEvacuatedBytesForReduceMemory = 12 * Page::kPageSize;
 
     int max_evacuated_bytes;
     int target_fragmentation_percent;
 
@@ skipping 3948 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal