Add support for .bss section in oat files.

Change-Id: I779b80b8139d9afdc28373f8c68edff5df7726ce
diff --git a/runtime/gc/accounting/atomic_stack.h b/runtime/gc/accounting/atomic_stack.h
index 72734e9..5224d64 100644
--- a/runtime/gc/accounting/atomic_stack.h
+++ b/runtime/gc/accounting/atomic_stack.h
@@ -236,8 +236,8 @@
   // Size in number of elements.
   void Init() {
     std::string error_msg;
-    mem_map_.reset(MemMap::MapAnonymous(name_.c_str(), NULL, capacity_ * sizeof(begin_[0]),
-                                        PROT_READ | PROT_WRITE, false, &error_msg));
+    mem_map_.reset(MemMap::MapAnonymous(name_.c_str(), nullptr, capacity_ * sizeof(begin_[0]),
+                                        PROT_READ | PROT_WRITE, false, false, &error_msg));
     CHECK(mem_map_.get() != NULL) << "couldn't allocate mark stack.\n" << error_msg;
     uint8_t* addr = mem_map_->Begin();
     CHECK(addr != NULL);