[heap] No leakage of store-buffer.h outside of heap.

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index 1e1c5b25893f61887a1688a5e39338ee10edc3d7..6738759803f5f7e6e34c6d4364dc754355a960f9 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -443,6 +443,9 @@ void Heap::RecordFixedArrayElements(FixedArray* array, int offset, int length) {
   }
 }
 
+Address* Heap::store_buffer_top_address() {
+  return store_buffer()->top_address();
+}
 
 bool Heap::AllowedToBeMigrated(HeapObject* obj, AllocationSpace dst) {
   // Object migration is governed by the following rules: