Cache number of type arguments in class object instead of recalculating it.

runtime/vm/class_finalizer.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 2580 matching lines @@
     error ^= Parser::FormatError(script, token_pos, "Error", format, args);
   } else {
     error ^= Parser::FormatErrorWithAppend(
         prev_error, script, token_pos, "Error", format, args);
   }
   va_end(args);
   ReportError(error);
 }
 
 
-void ClassFinalizer::ReportError(const char* format, ...) {
-  va_list args;
-  va_start(args, format);
-  const Error& error = Error::Handle(
-      Parser::FormatError(Script::Handle(), -1, "Error", format, args));
-  va_end(args);
-  ReportError(error);
-}
-
-
 void ClassFinalizer::VerifyImplicitFieldOffsets() {
 #ifdef DEBUG
   Isolate* isolate = Isolate::Current();
   const ClassTable& class_table = *(isolate->class_table());
   Class& cls = Class::Handle(isolate);
   Array& fields_array = Array::Handle(isolate);
   Field& field = Field::Handle(isolate);
   String& name = String::Handle(isolate);
   String& expected_name = String::Handle(isolate);
   Error& error = Error::Handle(isolate);
@@ skipping 40 matching lines @@
   expected_name ^= String::New("_offset");
   ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name));
   field ^= fields_array.At(2);
   ASSERT(field.Offset() == TypedDataView::length_offset());
   name ^= field.name();
   ASSERT(name.Equals("length"));
 #endif
 }
 
 }  // namespace dart