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

runtime/vm/flow_graph_compiler_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 11 matching lines @@
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(bool, print_ast);
 DECLARE_FLAG(bool, print_scopes);
 DECLARE_FLAG(bool, enable_type_checks);
 
 
 FlowGraphCompiler::~FlowGraphCompiler() {
   // BlockInfos are zone-allocated, so their destructors are not called.
   // Verify the labels explicitly here.
   for (int i = 0; i < block_info_.length(); ++i) {
-    ASSERT(!block_info_[i]->label.IsLinked());
+    ASSERT(!block_info_[i]->jump_label()->IsLinked());
   }
 }
 
 
 bool FlowGraphCompiler::SupportsUnboxedMints() {
   return false;
 }
 
 
 void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler,
@@ skipping 574 matching lines @@
 
 
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   UNIMPLEMENTED();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM