Add back functionality removed in r210497.

Instead of asserting, output a message stating that a null pointer was found.

llvm-svn: 211430

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/LoopPass.cpp b/llvm/lib/Analysis/LoopPass.cpp
index 2c6e6e3ffff..7bd866e73e1 100644
--- a/llvm/lib/Analysis/LoopPass.cpp
+++ b/llvm/lib/Analysis/LoopPass.cpp
@@ -45,8 +45,10 @@ public:
     for (Loop::block_iterator b = L->block_begin(), be = L->block_end();
          b != be;
          ++b) {
-      assert((*b) != nullptr && "Expecting non-null block");
-      (*b)->print(Out);
+      if (*b)
+        (*b)->print(Out);
+      else
+        Out << "Printing <null> block";
     }
     return false;
   }