Fix wrongly recorded uses after polymorphic inlining.

runtime/vm/flow_graph_inliner.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_inliner.h"
 
 #include "vm/block_scheduler.h"
 #include "vm/compiler.h"
 #include "vm/flags.h"
 #include "vm/flow_graph.h"
@@ skipping 993 matching lines @@
       // The call target is shared with a previous inlined variant.  Share
       // the graph.  This requires a join block at the entry, and edge-split
       // form requires a target for each branch.
       //
       // Represent the sharing by recording a fresh target for the first
       // variant and the shared join for all later variants.
       if (inlined_entries_[i]->IsGraphEntry()) {
         // Convert the old target entry to a new join entry.
         TargetEntryInstr* old_target =
             inlined_entries_[i]->AsGraphEntry()->normal_entry();
+        // Unuse all inputs in the the old graph entry since it is not part of
+        // the graph anymore. A new target be created instead.

[srdjan, 2014/02/01 00:47:36]

Fix last sentence in the comment.

[Florian Schneider, 2014/02/03 09:47:42]

Oops. Will fix this my next CL.

+        inlined_entries_[i]->AsGraphEntry()->UnuseAllInputs();
+
         JoinEntryInstr* new_join = BranchSimplifier::ToJoinEntry(old_target);
         old_target->ReplaceAsPredecessorWith(new_join);
         for (intptr_t j = 0; j < old_target->dominated_blocks().length(); ++j) {
           BlockEntryInstr* block = old_target->dominated_blocks()[j];
           new_join->AddDominatedBlock(block);
         }
         // Create a new target with the join as unconditional successor.
         TargetEntryInstr* new_target =
             new TargetEntryInstr(owner_->caller_graph()->allocate_block_id(),
                                  old_target->try_index());
@@ skipping 453 matching lines @@
         OS::Print("After Inlining of %s\n", flow_graph_->
                   parsed_function().function().ToFullyQualifiedCString());
         FlowGraphPrinter printer(*flow_graph_);
         printer.PrintBlocks();
       }
     }
   }
 }
 
 }  // namespace dart