Delete patch classes once they are applied

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 298 matching lines @@
   // also allows us to reset the marked_for_parsing state in case we see an
   // error.
   VMTagScope tagScope(thread, VMTag::kCompileClassTagId);
   GrowableHandlePtrArray<const Class> parse_list(thread->zone(), 4);
   GrowableHandlePtrArray<const Class> patch_list(thread->zone(), 4);
 
   // Parse the class and all the interfaces it implements and super classes.
   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
     if (FLAG_trace_compiler) {
-      THR_Print("Compiling Class %s '%s'\n", "", cls.ToCString());
+      THR_Print("Compiling Class '%s'\n", cls.ToCString());
     }
 
     // Add the primary class which needs to be parsed to the parse list.
     // Mark the class as parsed so that we don't recursively add the same
     // class back into the list.
     parse_list.Add(cls);
     cls.set_is_marked_for_parsing();
 
     // Add all super classes, interface classes and patch class if one
     // exists to the corresponding lists.
@@ skipping 1547 matching lines @@
 }
 
 
 void BackgroundCompiler::EnsureInit(Thread* thread) {
   UNREACHABLE();
 }
 
 #endif  // DART_PRECOMPILED
 
 }  // namespace dart