Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149814 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 3c97e14..cf67935 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -93,7 +93,7 @@
   case MVT::iPTR:     return "MVT::iPTR";
   case MVT::iPTRAny:  return "MVT::iPTRAny";
   case MVT::Untyped:  return "MVT::Untyped";
-  default: assert(0 && "ILLEGAL VALUE TYPE!"); return "";
+  default: llvm_unreachable("ILLEGAL VALUE TYPE!");
   }
 }
 
@@ -515,7 +515,7 @@
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, NoCapture));
     } else
-      assert(0 && "Unknown property!");
+      llvm_unreachable("Unknown property!");
   }
 
   // Sort the argument attributes for later benefit.