Fix slot buffers of abandoned evacuation candidates.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 956d0c953a0dbddcb3adcae3eadc80037cf10297..948a6be79538e02748f3cf5eedeb6ac043cf17db 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -2690,8 +2690,10 @@ void MarkCompactCollector::EvacuatePages() {
         // Without room for expansion evacuation is not guaranteed to succeed.
         // Pessimistically abandon unevacuated pages.
         for (int j = i; j < npages; j++) {
-          evacuation_candidates_[j]->ClearEvacuationCandidate();
-          evacuation_candidates_[j]->SetFlag(Page::RESCAN_ON_EVACUATION);
+          Page* page = evacuation_candidates_[j];
+          slots_buffer_allocator_.DeallocateChain(page->slots_buffer_address());
+          page->ClearEvacuationCandidate();
+          page->SetFlag(Page::RESCAN_ON_EVACUATION);
         }
         return;
       }