Copy ICData descriptors when starting background compilation, so that they do not change while comp…

runtime/vm/compiler.h

 // 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.
 
 #ifndef VM_COMPILER_H_
 #define VM_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/runtime_entry.h"
 #include "vm/thread_pool.h"
 
 namespace dart {
 
 // Forward declarations.
 class Class;
 class Code;
 class Function;
 class Library;
 class ParsedFunction;
 class RawInstance;
 class Script;
 class SequenceNode;
 
 class Compiler : public AllStatic {
  public:
   static const intptr_t kNoOSRDeoptId = Thread::kNoDeoptId;
 
+  static bool IsBackgroundCompilation();
+
   // Extracts top level entities from the script and populates
   // the class dictionary of the library.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* Compile(const Library& library, const Script& script);
 
   // Extracts function and field symbols from the class and populates
   // the class.
   //
   // Returns Error::null() if there is no compilation error.
@@ skipping 113 matching lines @@
 
   // Lightweight access to length of compiler queue.
   intptr_t function_queue_length_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BackgroundCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_H_