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

runtime/vm/kernel_reader.h

Index: runtime/vm/kernel_reader.h
diff --git a/runtime/vm/kernel_reader.h b/runtime/vm/kernel_reader.h
index 23dc2e92640a3baa34f15f8979a61406fa279da5..2730cffe2f0fb2fecc42ba88e6945b913621faf2 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -25,8 +25,6 @@ class BuildingTranslationHelper : public TranslationHelper {
       : TranslationHelper(thread, zone, isolate), reader_(reader) {}
   virtual ~BuildingTranslationHelper() {}
 
-  virtual void SetFinalize(bool finalize);
-
   virtual RawLibrary* LookupLibraryByKernelLibrary(Library* library);
   virtual RawClass* LookupClassByKernelClass(Class* klass);
 
@@ -60,9 +58,10 @@ class KernelReader {
         zone_(thread_->zone()),
         isolate_(thread_->isolate()),
         translation_helper_(this, thread_, zone_, isolate_),
-        type_translator_(&translation_helper_, &active_class_, !bootstrapping),
+        type_translator_(&translation_helper_,
+                         &active_class_,
+                         /*finalize=*/false),
         bootstrapping_(bootstrapping),
-        finalize_(!bootstrapping),
         buffer_(buffer),
         buffer_length_(len) {}
 
@@ -83,7 +82,7 @@ class KernelReader {
   friend class BuildingTranslationHelper;
 
   void ReadPreliminaryClass(dart::Class* klass, Class* kernel_klass);
-  void ReadClass(const dart::Library& library, Class* kernel_klass);
+  dart::Class& ReadClass(const dart::Library& library, Class* kernel_klass);
   void ReadProcedure(const dart::Library& library,
                      const dart::Class& owner,
                      Procedure* procedure,
@@ -110,9 +109,6 @@ class KernelReader {
 
   bool bootstrapping_;
 
-  // Should created classes be finalized when they are created?
-  bool finalize_;
-
   const uint8_t* buffer_;
   intptr_t buffer_length_;