Add attributions so printf like functions can have their arguments checked.

runtime/vm/freelist.cc

Index: runtime/vm/freelist.cc
diff --git a/runtime/vm/freelist.cc b/runtime/vm/freelist.cc
index c2ce1855f17652fc76305df5afdc5f8e8e94bab2..dc71f0eec7308f0004a3a77da01ade606212d700 100644
--- a/runtime/vm/freelist.cc
+++ b/runtime/vm/freelist.cc
@@ -162,7 +162,8 @@ void FreeList::Print() const {
     total_length += length;
     intptr_t size = length * i * kObjectAlignment;
     total_size += size;
-    OS::Print("%*d %*d %*d\n", 10, i * kObjectAlignment, 10, length, 10, size);
+    OS::Print("%*d %*"Pd" %*"Pd"\n",
+              10, i * kObjectAlignment, 10, length, 10, size);
   }
   OS::Print("--------------------------------\n");
   OS::Print("%*d %*d %*d\n", 10, total_index, 10, total_length, 10, total_size);