Index: lib/LTO/LTOBackend.cpp
===================================================================
--- lib/LTO/LTOBackend.cpp
+++ lib/LTO/LTOBackend.cpp
@@ -137,7 +137,8 @@
   AAManager AA;
 
   // Parse a custom AA pipeline if asked to.
-  assert(PB.parseAAPipeline(AA, "default"));
+  if (!PB.parseAAPipeline(AA, "default"))
+    llvm_unreachable("Error parsing AA pipeline");
 
   LoopAnalysisManager LAM;
   FunctionAnalysisManager FAM;