Ignore redundant parallel moves when checking if a block is empty.

runtime/vm/flow_graph_compiler.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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 207 matching lines @@
       FLAG_deoptimize_filter != NULL &&
       strstr(parsed_function().function().ToFullyQualifiedCString(),
              FLAG_deoptimize_filter) != NULL) {
     return true;
   }
   return false;
 }
 
 
 static bool IsEmptyBlock(BlockEntryInstr* block) {
-  return !block->HasParallelMove() &&
+  return !block->HasNonRedundantParallelMove() &&
          block->next()->IsGoto() &&
-         !block->next()->AsGoto()->HasParallelMove();
+         !block->next()->AsGoto()->HasNonRedundantParallelMove();
 }
 
 
 void FlowGraphCompiler::CompactBlock(BlockEntryInstr* block) {
   BlockInfo* block_info = block_info_[block->postorder_number()];
 
   // Break out of cycles in the control flow graph.
   if (block_info->is_marked()) {
     return;
   }
@@ skipping 1250 matching lines @@
     threshold = FLAG_optimization_counter_scale * basic_blocks +
         FLAG_min_optimization_counter_threshold;
     if (threshold > FLAG_optimization_counter_threshold) {
       threshold = FLAG_optimization_counter_threshold;
     }
   }
   return threshold;
 }
 
 }  // namespace dart