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

runtime/vm/locations.cc

Index: runtime/vm/locations.cc
diff --git a/runtime/vm/locations.cc b/runtime/vm/locations.cc
index 3f7ded17a157430d6763b2c4282761e8e5b0b6a4..efd1a19026144c9249bff2b46b53e7ddcda568ef 100644
--- a/runtime/vm/locations.cc
+++ b/runtime/vm/locations.cc
@@ -92,9 +92,9 @@ const char* Location::Name() const {
 
 void Location::PrintTo(BufferFormatter* f) const {
   if (kind() == kStackSlot) {
-    f->Print("S%+d", stack_index());
+    f->Print("S%+"Pd"", stack_index());
   } else if (kind() == kDoubleStackSlot) {
-    f->Print("DS%+d", stack_index());
+    f->Print("DS%+"Pd"", stack_index());
   } else {
     f->Print("%s", Name());
   }
@@ -103,7 +103,7 @@ void Location::PrintTo(BufferFormatter* f) const {
 
 void Location::Print() const {
   if (kind() == kStackSlot) {
-    OS::Print("S%+d", stack_index());
+    OS::Print("S%+"Pd"", stack_index());
   } else {
     OS::Print("%s", Name());
   }