Fix selection of popular pages in store buffer.

src/store-buffer.cc

Index: src/store-buffer.cc
diff --git a/src/store-buffer.cc b/src/store-buffer.cc
index 22a546742c85f376839ef68528728cd69bb3cc53..e89eb1bfed4a6a3803858ec13cffface8cea3689 100644
--- a/src/store-buffer.cc
+++ b/src/store-buffer.cc
@@ -224,7 +224,7 @@ void StoreBuffer::ExemptPopularPages(int prime_sample_step, int threshold) {
       containing_chunk = MemoryChunk::FromAnyPointerAddress(heap_, addr);
     }
     int old_counter = containing_chunk->store_buffer_counter();
-    if (old_counter == threshold) {
+    if (old_counter >= threshold) {
       containing_chunk->set_scan_on_scavenge(true);
       created_new_scan_on_scavenge_pages = true;
     }