[heap] Fix chunk map removal for large objects.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 7c2789ec196add16d7fbc1ea8b806ea162cba8fd..a7d872128f0c2f087d6125207dc5e3e53b68fe09 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -3126,8 +3126,8 @@ void LargeObjectSpace::FreeUnmarkedObjects() {
       Address free_start;
       if ((free_start = current->GetAddressToShrink()) != 0) {
         // TODO(hpayer): Perform partial free concurrently.
-        heap()->memory_allocator()->PartialFreeMemory(current, free_start);
         RemoveChunkMapEntries(current, free_start);
+        heap()->memory_allocator()->PartialFreeMemory(current, free_start);
       }
       previous = current;
       current = current->next_page();