One more iteration of PcDescriptor iterator improvement: do not copy record but access individual …

runtime/vm/simulator_arm.cc

Index: runtime/vm/simulator_arm.cc
===================================================================
--- runtime/vm/simulator_arm.cc	(revision 38356)
+++ runtime/vm/simulator_arm.cc	(working copy)
@@ -271,12 +271,11 @@
       PcDescriptors::Handle(code.pc_descriptors());
   PcDescriptors::Iterator iter(descriptors, RawPcDescriptors::kAnyKind);
   while (iter.HasNext()) {
-    RawPcDescriptors::PcDescriptorRec rec;
-    iter.NextRec(&rec);
-    if (rec.pc() == pc) {
-      return rec.token_pos();
-    } else if ((token_pos <= 0) && (rec.pc() > pc)) {
-      token_pos = rec.token_pos();
+    uword current_pc = iter.NextPc();
+    if (current_pc == pc) {
+      return iter.current_token_pos();
+    } else if ((token_pos <= 0) && (current_pc > pc)) {
+      token_pos = iter.current_token_pos();
     }
   }
   return token_pos;