Better error message.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/LLVMCConfigurationEmitter.cpp b/utils/TableGen/LLVMCConfigurationEmitter.cpp
index b685840..1c7e5d0 100644
--- a/utils/TableGen/LLVMCConfigurationEmitter.cpp
+++ b/utils/TableGen/LLVMCConfigurationEmitter.cpp
@@ -1397,7 +1397,7 @@
   else if (EmitCaseTest2Args(TestName, d, IndentLevel, OptDescs, O))
     return;
   else
-    throw TestName + ": unknown edge property!";
+    throw "Unknown test '" + TestName + "' used in the 'case' construct!";
 }