Clone both descriptor and data array when compiling in background

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 588 matching lines @@
         ZoneGrowableArray<const ICData*>* ic_data_array =
             new(zone) ZoneGrowableArray<const ICData*>();
         if (optimized()) {
           // Extract type feedback before the graph is built, as the graph
           // builder uses it to attach it to nodes.
           ASSERT(function.deoptimization_counter() <
                  FLAG_max_deoptimization_counter_threshold);
 
           // 'Freeze' ICData in background compilation so that it does not
           // change while compiling.
-          const bool clone_descriptors = Compiler::IsBackgroundCompilation();
-          function.RestoreICDataMap(ic_data_array, clone_descriptors);
+          const bool clone_ic_data = Compiler::IsBackgroundCompilation();
+          function.RestoreICDataMap(ic_data_array, clone_ic_data);
 
           if (Compiler::IsBackgroundCompilation() &&
               (function.ic_data_array() == Array::null())) {
             Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId);
           }
           if (FLAG_print_ic_data_map) {
             for (intptr_t i = 0; i < ic_data_array->length(); i++) {
               if ((*ic_data_array)[i] != NULL) {
                 THR_Print("%" Pd " ", i);
                 FlowGraphPrinter::PrintICData(*(*ic_data_array)[i]);
@@ skipping 1263 matching lines @@
 }
 
 
 void BackgroundCompiler::EnsureInit(Thread* thread) {
   UNREACHABLE();
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart