VM: [Kernel] Implement CatchBlockEntryInstr::should_restore_closure_context on all platforms.

runtime/vm/flow_graph_allocator.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 "vm/flow_graph_allocator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/intermediate_language.h"
 #include "vm/il_printer.h"
 #include "vm/flow_graph.h"
@@ skipping 645 matching lines @@
   }
 }
 
 
 void FlowGraphAllocator::ProcessInitialDefinition(Definition* defn,
                                                   LiveRange* range,
                                                   BlockEntryInstr* block) {
 #if defined(TARGET_ARCH_DBC)
   if (block->IsCatchBlockEntry()) {
     if (defn->IsParameter()) {
+      // This must be in sync with FlowGraphCompiler::CatchEntryRegForVariable.
       ParameterInstr* param = defn->AsParameter();
       intptr_t slot_index = param->index();
       AssignSafepoints(defn, range);
       range->finger()->Initialize(range);
       slot_index = kNumberOfCpuRegisters - 1 - slot_index;
       range->set_assigned_location(Location::RegisterLocation(slot_index));
       SplitInitialDefinitionAt(range, block->lifetime_position() + 2);
       ConvertAllUses(range);
       BlockLocation(Location::RegisterLocation(slot_index), 0, kMaxPosition);
     } else {
@@ skipping 2412 matching lines @@
       FlowGraphPrinter printer(flow_graph_, true);
       printer.PrintBlocks();
 #endif
     }
     THR_Print("----------------------------------------------\n");
   }
 }
 
 
 }  // namespace dart