[heap] Synchronize concurrent chunk map modifications.

src/heap/spaces-inl.h

Index: src/heap/spaces-inl.h
diff --git a/src/heap/spaces-inl.h b/src/heap/spaces-inl.h
index f3f9215f3de19c18cb2e5bb2659b3cb6bffacf50..8fbeb26c57b10840dde39e1772835d4ae4755277 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -288,7 +288,7 @@ MemoryChunk* MemoryChunk::FromAnyPointerAddress(Heap* heap, Address addr) {
   MemoryChunk* chunk = MemoryChunk::FromAddress(addr);
   uintptr_t offset = addr - chunk->address();
   if (offset < MemoryChunk::kHeaderSize || !chunk->HasPageHeader()) {
-    chunk = heap->lo_space()->FindPage(addr);
+    chunk = heap->lo_space()->FindPageThreadSafe(addr);
   }
   return chunk;
 }