Reviewers: ulan,

Description:
Fix old space check in IsSlotInBlackObject.

BUG=

Please review this at https://codereview.chromium.org/993513009/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+2, -1 lines):
  M 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 0c9eeff0041d3c92988d407e162bb50d81718468..51e3f1e7eb639766829694922f314c09f990f0dc 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3059,7 +3059,8 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,

 bool MarkCompactCollector::IsSlotInBlackObject(Page* p, Address slot) {
   // This function does not support large objects right now.
-  if (p->owner() == NULL) return true;
+  Space* owner = p->owner();
+  if (owner == heap_->lo_space() || owner == NULL) return true;

   uint32_t mark_bit_index = p->AddressToMarkbitIndex(slot);
   unsigned int start_index = mark_bit_index >> Bitmap::kBitsPerCellLog2;


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