[turbofan] Fix loop analysis bug with certain phi structures.

src/compiler/loop-analysis.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/loop-analysis.h"
 
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-marker.h"
 #include "src/compiler/node-properties.h"
@@ skipping 217 matching lines @@
 
     // Create a new loop.
     loops_.push_back({node, nullptr, nullptr, nullptr});
     loop_tree_->NewLoop();
     SetBackwardMark(node, loop_num);
     loop_tree_->node_to_loop_num_[node->id()] = loop_num;
 
     // Setup loop mark for phis attached to loop header.
     for (Node* use : node->uses()) {
       if (NodeProperties::IsPhi(use)) {
+        info(use);  // create the NodeInfo
         SetBackwardMark(use, loop_num);
         loop_tree_->node_to_loop_num_[use->id()] = loop_num;
       }
     }
 
     return loop_num;
   }
 
   void ResizeBackwardMarks() {
     int new_width = width_ + 1;
@@ skipping 209 matching lines @@
   finder.Run();
   if (FLAG_trace_turbo_graph) {
     finder.Print();
   }
   return loop_tree;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8