Make special RPO computation iterative during scheduling.

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/generic-node-inl.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 
 namespace v8 {
@@ skipping 328 matching lines @@
 
 
 static BasicBlock::RpoNumber GetRpo(BasicBlock* block) {
   if (block == NULL) return BasicBlock::RpoNumber::Invalid();
   return block->GetRpoNumber();
 }
 
 
 static BasicBlock::RpoNumber GetLoopEndRpo(const BasicBlock* block) {
   if (!block->IsLoopHeader()) return BasicBlock::RpoNumber::Invalid();
-  return BasicBlock::RpoNumber::FromInt(block->loop_end());
+  return block->loop_end()->GetRpoNumber();
 }
 
 
 InstructionBlock::InstructionBlock(Zone* zone, const BasicBlock* block)
     : successors_(static_cast<int>(block->SuccessorCount()),
                   BasicBlock::RpoNumber::Invalid(), zone),
       predecessors_(static_cast<int>(block->PredecessorCount()),
                     BasicBlock::RpoNumber::Invalid(), zone),
       phis_(zone),
       id_(block->id()),
@@ skipping 300 matching lines @@
       os << " B" << succ_block->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8