blink_gc_plugin: Make RecordInfo::Get{Fields,Bases} return deterministic order

tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp

Index: tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp
diff --git a/tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp b/tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp
index f0a9bf3dba0a15198331c5a862c8fcfefceed212..a1f5bc1a893e33f964a8ae4e64f989090a49f413 100644
--- a/tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp
+++ b/tools/clang/blink_gc_plugin/CheckFinalizerVisitor.cpp
@@ -107,8 +107,7 @@ bool CheckFinalizerVisitor::VisitMemberExpr(MemberExpr* member) {
   if (!info)
     return true;
 
-  RecordInfo::Fields::iterator it = info->GetFields().find(field);
-  if (it == info->GetFields().end())
+  if (!info->HasField(field))
     return true;
 
   if (seen_members_.find(member) != seen_members_.end())
@@ -116,9 +115,9 @@ bool CheckFinalizerVisitor::VisitMemberExpr(MemberExpr* member) {
 
   bool as_eagerly_finalized = false;
   if (blacklist_context_ &&
-      MightBeCollected(&it->second, &as_eagerly_finalized)) {
+      MightBeCollected(&info->GetField(field).second, &as_eagerly_finalized)) {
     finalized_fields_.push_back(
-        Error(member, as_eagerly_finalized, &it->second));
+        Error(member, as_eagerly_finalized, &info->GetField(field).second));
     seen_members_.insert(member);
   }
   return true;