Revert "Debugging in kernel shaping up."

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "lib/stacktrace.h"
@@ skipping 5390 matching lines @@
   // NOTE: Now the VM owns the [kernel_program] memory!  Currently we do not
   // free it because (similar to the token stream) it will be used to repeatedly
   // run the `kernel::FlowGraphBuilder()`.
   kernel::KernelReader reader(
       reinterpret_cast<kernel::Program*>(kernel_program));
   const Object& tmp = reader.ReadProgram();
   if (tmp.IsError()) {
     return Api::NewHandle(T, tmp.raw());
   }
   library ^= tmp.raw();
+  library.set_debuggable(false);
   I->object_store()->set_root_library(library);
   return Api::NewHandle(T, library.raw());
 #endif
 }
 
 
 DART_EXPORT Dart_Handle Dart_RootLibrary() {
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
   CHECK_ISOLATE(isolate);
@@ skipping 1398 matching lines @@
 }
 
 
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context) {
 #ifndef PRODUCT
   Profiler::DumpStackTrace(context);
 #endif
 }
 
 }  // namespace dart