Switch assert(0/false) llvm_unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprAgg.cpp b/lib/CodeGen/CGExprAgg.cpp
index 856378b..c321faf 100644
--- a/lib/CodeGen/CGExprAgg.cpp
+++ b/lib/CodeGen/CGExprAgg.cpp
@@ -318,7 +318,7 @@
   case CK_DerivedToBase:
   case CK_BaseToDerived:
   case CK_UncheckedDerivedToBase: {
-    assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: "
+    llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: "
                 "should have been unpacked before we got here");
     break;
   }