Ensure that safepoints are assigned to the live ranges of constants.

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 504 matching lines @@
       // Slot index for the rightmost fixed parameter is -1.
       slot_index -= flow_graph_.num_non_copied_params();
 
       range->set_assigned_location(Location::StackSlot(slot_index));
       range->set_spill_slot(Location::StackSlot(slot_index));
       if (flow_graph_.num_copied_params() > 0) {
         ASSERT(spill_slots_.length() == slot_index);
         spill_slots_.Add(range->End());
         quad_spill_slots_.Add(false);
       }
-      AssignSafepoints(range);
     } else {
       ConstantInstr* constant = defn->AsConstant();
       ASSERT(constant != NULL);
       range->set_assigned_location(Location::Constant(constant->value()));
       range->set_spill_slot(Location::Constant(constant->value()));
     }
+    AssignSafepoints(range);
     range->finger()->Initialize(range);
     UsePosition* use =
         range->finger()->FirstRegisterBeneficialUse(graph_entry->start_pos());
     if (use != NULL) {
       LiveRange* tail =
           SplitBetween(range, graph_entry->start_pos(), use->pos());
       // Parameters and constants are tagged, so allocated to CPU registers.
       CompleteRange(tail, Location::kRegister);
     }
     ConvertAllUses(range);
@@ skipping 1955 matching lines @@
     OS::Print("-- [after ssa allocator] ir [%s] -------------\n",
               function.ToFullyQualifiedCString());
     FlowGraphPrinter printer(flow_graph_, true);
     printer.PrintBlocks();
     OS::Print("----------------------------------------------\n");
   }
 }
 
 
 }  // namespace dart