[turbofan] Deferred blocks splintering.

src/compiler/instruction.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
@@ skipping 399 matching lines @@
       ao_number_(rpo_number),
       rpo_number_(rpo_number),
       loop_header_(loop_header),
       loop_end_(loop_end),
       code_start_(-1),
       code_end_(-1),
       deferred_(deferred),
       handler_(handler),
       needs_frame_(false),
       must_construct_frame_(false),
-      must_deconstruct_frame_(false) {}
+      must_deconstruct_frame_(false),
+      last_deferred_(RpoNumber::Invalid()) {}
 
 
 size_t InstructionBlock::PredecessorIndexOf(RpoNumber rpo_number) const {
   size_t j = 0;
   for (InstructionBlock::Predecessors::const_iterator i = predecessors_.begin();
        i != predecessors_.end(); ++i, ++j) {
     if (*i == rpo_number) break;
   }
   return j;
 }
@@ skipping 377 matching lines @@
       os << " B" << succ.ToInt();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8