The 'forward_as' property did not use its second argument.

See PR4159 for details. Patch by Martin Nowack!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71054 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/LLVMCConfigurationEmitter.cpp b/utils/TableGen/LLVMCConfigurationEmitter.cpp
index 2dee3e9..0157b61 100644
--- a/utils/TableGen/LLVMCConfigurationEmitter.cpp
+++ b/utils/TableGen/LLVMCConfigurationEmitter.cpp
@@ -1444,7 +1444,7 @@
     else if (ActionName == "forward_as") {
       checkNumberOfArguments(&Dag, 2);
       const std::string& Name = InitPtrToString(Dag.getArg(0));
-      const std::string& NewName = InitPtrToString(Dag.getArg(0));
+      const std::string& NewName = InitPtrToString(Dag.getArg(1));
       EmitForwardOptionPropertyHandlingCode(OptDescs.FindOption(Name),
                                             IndentLevel, NewName, O);
     }