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

runtime/vm/kernel_to_il.h

Index: runtime/vm/kernel_to_il.h
diff --git a/runtime/vm/kernel_to_il.h b/runtime/vm/kernel_to_il.h
index eb3beca9ce37eb05b396e045af259ec6b7b54d00..d0351b987fc99ccd618c2e5be70175b20e275831 100644
--- a/runtime/vm/kernel_to_il.h
+++ b/runtime/vm/kernel_to_il.h
@@ -205,11 +205,6 @@ class TranslationHelper {
 
   Heap::Space allocation_space() { return allocation_space_; }
 
-  // Set whether unfinalized classes should be finalized.  The base class
-  // implementation used at flow graph construction time looks up classes in the
-  // VM's heap, all of which should already be finalized.
-  virtual void SetFinalize(bool finalize) {}
-
   RawInstance* Canonicalize(const Instance& instance);
 
   const dart::String& DartString(const char* content) {
@@ -244,6 +239,8 @@ class TranslationHelper {
   virtual RawLibrary* LookupLibraryByKernelLibrary(Library* library);
   virtual RawClass* LookupClassByKernelClass(Class* klass);
 
+  RawUnresolvedClass* ToUnresolvedClass(Class* klass);
+
   RawField* LookupFieldByKernelField(Field* field);
   RawFunction* LookupStaticMethodByKernelProcedure(Procedure* procedure);
   RawFunction* LookupConstructorByKernelConstructor(Constructor* constructor);
@@ -282,8 +279,9 @@ class TranslationHelper {
 // runtime unless explicitly specified otherwise.
 class DartTypeTranslator : public DartTypeVisitor {
  public:
-  DartTypeTranslator(TranslationHelper* helper, ActiveClass* active_class,
-                     bool finalize = true)
+  DartTypeTranslator(TranslationHelper* helper,
+                     ActiveClass* active_class,
+                     bool finalize = false)
       : translation_helper_(*helper),
         active_class_(active_class),
         zone_(helper->zone()),