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

src/compiler/loop-analysis.cc

Index: src/compiler/loop-analysis.cc
diff --git a/src/compiler/loop-analysis.cc b/src/compiler/loop-analysis.cc
index 38406f83917523ecc9221b1a5b917ad2fca3742a..2a1487136971530e78f88aa43741f7b2a3afbe5a 100644
--- a/src/compiler/loop-analysis.cc
+++ b/src/compiler/loop-analysis.cc
@@ -235,6 +235,7 @@ class LoopFinderImpl {
     // 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;
       }