Add pass to remove empty blocks and recompute fall-through targets.

runtime/vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 1318 matching lines @@
 // is located in intermediate_language_<arch>.cc
 
 #define __ compiler->assembler()->
 
 void GraphEntryInstr::PrepareEntry(FlowGraphCompiler* compiler) {
   // Nothing to do.
 }
 
 
 void JoinEntryInstr::PrepareEntry(FlowGraphCompiler* compiler) {
-  __ Bind(compiler->GetBlockLabel(this));
+  __ Bind(compiler->GetJumpLabel(this));
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }
 }
 
 
 void TargetEntryInstr::PrepareEntry(FlowGraphCompiler* compiler) {
-  __ Bind(compiler->GetBlockLabel(this));
+  __ Bind(compiler->GetJumpLabel(this));
   if (IsCatchEntry()) {
     compiler->AddExceptionHandler(catch_try_index(),
                                   try_index(),
                                   compiler->assembler()->CodeSize(),
                                   catch_handler_types_);
   }
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }
 }
@@ skipping 928 matching lines @@
     default:
       UNREACHABLE();
   }
   return kPowRuntimeEntry;
 }
 
 
 #undef __
 
 }  // namespace dart