[csa] Improve propagation of deferred block mark

src/compiler/schedule.cc

 // Copyright 2013 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/schedule.h"
 
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
 #include "src/ostreams.h"
 
@@ skipping 389 matching lines @@
   // Push forward the deferred block marks through newly inserted blocks and
   // other improperly marked blocks until a fixed point is reached.
   // TODO(danno): optimize the propagation
   bool done = false;
   while (!done) {
     done = true;
     for (auto block : all_blocks_) {
       if (!block->deferred()) {
         bool deferred = block->PredecessorCount() > 0;
         for (auto pred : block->predecessors()) {
-          if (!pred->deferred()) {
+          if (!pred->deferred() && (pred->rpo_number() < block->rpo_number())) {
             deferred = false;
           }
         }
         if (deferred) {
           block->set_deferred(true);
           done = false;
         }
       }
     }
   }
@@ skipping 81 matching lines @@
       }
       os << "\n";
     }
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8