VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 92ba4ff121e46e1e81cdc34a06de11ae15e468f9..913d91272a8b07c6fdfe0d226c3e99399f4dc2be 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -11865,7 +11865,7 @@ void Parser::ResolveType(ClassFinalizer::FinalizationKind finalization,
     const String& unresolved_class_name =
         String::Handle(Z, unresolved_class.ident());
     Class& resolved_type_class = Class::Handle(Z);
-    if (unresolved_class.library_prefix() == LibraryPrefix::null()) {
+    if (unresolved_class.library_or_library_prefix() == Object::null()) {
       // First check if the type is a function type parameter.
       if (!innermost_function().IsNull()) {
         // TODO(regis): Shortcut this lookup if no generic functions in scope.
@@ -11915,9 +11915,11 @@ void Parser::ResolveType(ClassFinalizer::FinalizationKind finalization,
       }
     } else {
       // Resolve class name in the scope of the library prefix.
-      const LibraryPrefix& lib_prefix =
-          LibraryPrefix::Handle(Z, unresolved_class.library_prefix());
-      resolved_type_class = lib_prefix.LookupClass(unresolved_class_name);
+      const Object& prefix =
+          Object::Handle(Z, unresolved_class.library_or_library_prefix());
+      ASSERT(prefix.IsLibraryPrefix());
+      resolved_type_class =
+          LibraryPrefix::Cast(prefix).LookupClass(unresolved_class_name);
     }
     // At this point, we can only have a parameterized_type.
     const Type& parameterized_type = Type::Cast(*type);
@@ -13452,8 +13454,8 @@ AstNode* Parser::ParseNewOperator(Token::Kind op_kind) {
         // into throwing a type error.
         const UnresolvedClass& cls =
             UnresolvedClass::Handle(Z, redirect_type.unresolved_class());
-        const LibraryPrefix& prefix =
-            LibraryPrefix::Handle(Z, cls.library_prefix());
+        const LibraryPrefix& prefix = LibraryPrefix::Cast(
+            Object::Handle(Z, cls.library_or_library_prefix()));
         if (!prefix.IsNull() && !prefix.is_loaded() &&
             !FLAG_load_deferred_eagerly) {
           // If the redirection type is unresolved because it refers to