Revert "Store actual Reference(s) for additional exports."

runtime/vm/kernel_binary_flowgraph.cc

Index: runtime/vm/kernel_binary_flowgraph.cc
diff --git a/runtime/vm/kernel_binary_flowgraph.cc b/runtime/vm/kernel_binary_flowgraph.cc
index 9a2b13a116dd899194367c87b571d56c42f3072f..a9fdd607e3cc2a1342e8c6c7b78004001c729985 100644
--- a/runtime/vm/kernel_binary_flowgraph.cc
+++ b/runtime/vm/kernel_binary_flowgraph.cc
@@ -434,13 +434,6 @@ void LibraryHelper::ReadUntilExcluding(Field field) {
       }
       if (++next_read_ == field) return;
     }
-    case kAdditionalExports: {
-      intptr_t name_count = builder_->ReadUInt();
-      for (intptr_t i = 0; i < name_count; ++i) {
-        builder_->SkipCanonicalNameReference();
-      }
-      if (++next_read_ == field) return;
-    }
     case kParts: {
       intptr_t part_count = builder_->ReadUInt();  // read list length.
       for (intptr_t i = 0; i < part_count; ++i) {