[heap] Fix mark bits for partially compacted pages.

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 8a32ba8bda28d08c91b6876a3c4d9ed038fad9f6..8232dd5b0e0b6d819a3adfae3a2ecc99c01489d3 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3353,6 +3353,12 @@ bool MarkCompactCollector::EvacuateLiveObjectsFromPage(
       HeapObject* target_object = nullptr;
       AllocationResult allocation = target_space->AllocateRaw(size, alignment);
       if (!allocation.To(&target_object)) {
+        // We need to abort compaction for this page. Make sure that we reset
+        // the mark bits for objects that have already been migrated.
+        if (i > 0) {
+          p->markbits()->ClearRange(p->AddressToMarkbitIndex(p->area_start()),
+                                    p->AddressToMarkbitIndex(object_addr));
+        }
         return false;
       }