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

runtime/vm/coverage.cc

Index: runtime/vm/coverage.cc
===================================================================
--- runtime/vm/coverage.cc	(revision 38356)
+++ runtime/vm/coverage.cc	(working copy)
@@ -95,11 +95,10 @@
       RawPcDescriptors::kIcCall | RawPcDescriptors::kUnoptStaticCall);
   while (iter.HasNext()) {
     HANDLESCOPE(isolate);
-    RawPcDescriptors::PcDescriptorRec rec;
-    iter.NextRec(&rec);
-    const ICData* ic_data = (*ic_data_array)[rec.deopt_id()];
+    const intptr_t deopt_id = iter.NextDeoptId();
+    const ICData* ic_data = (*ic_data_array)[deopt_id];
     if (!ic_data->IsNull()) {
-      const intptr_t token_pos = rec.token_pos();
+      const intptr_t token_pos = iter.current_token_pos();
       // Filter out descriptors that do not map to tokens in the source code.
       if ((token_pos < begin_pos) || (token_pos > end_pos)) {
         continue;