Fixes crashes in inliner: do not inline if icdata was cleared.

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 1598 matching lines @@
     }
   }
 
   bool IsEmpty() const { return first_ == NULL; }
 
   void Add(QueueElement* value) {
     ASSERT(value != NULL);
     if (first_ == NULL) {
       first_ = value;
     } else {
+      ASSERT(last_ != NULL);
       last_->set_next(value);
     }
     value->set_next(NULL);
     last_ = value;
   }
 
   QueueElement* Peek() const {
     return first_;
   }
 
@@ skipping 96 matching lines @@
     MonitorLocker ml_done(done_monitor_);
     *done_ = true;
     ml_done.Notify();
   }
 }
 
 
 void BackgroundCompiler::CompileOptimized(const Function& function) {
   ASSERT(Thread::Current()->IsMutatorThread());
   MonitorLocker ml(queue_monitor_);
+  ASSERT(running_);
   if (function_queue()->ContainsObj(function)) {
     return;
   }
   QueueElement* elem = new QueueElement(function);
   function_queue()->Add(elem);
   ml.Notify();
 }
 
 
 void BackgroundCompiler::VisitPointers(ObjectPointerVisitor* visitor) {
@@ skipping 174 matching lines @@
 }
 
 
 void BackgroundCompiler::EnsureInit(Thread* thread) {
   UNREACHABLE();
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart