Index: lib/IR/Verifier.cpp
===================================================================
--- lib/IR/Verifier.cpp
+++ lib/IR/Verifier.cpp
@@ -2020,7 +2020,7 @@
         continue;
 
       // FIXME: Once N is canonical, check "SP == &N".
-      Assert(SP->describes(&F),
+      Assert(SP && SP->describes(&F),
              "!dbg attachment points at wrong subprogram for function", N, &F,
              &I, DL, Scope, SP);
     }