Add a workaround for building with Clang.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111007 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index ebd163d..cc78410 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -146,9 +146,6 @@
   OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
                  cl::init("-"));
 
-  cl::opt<std::string>
-  InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
-
   cl::list<std::string>
   IncludeDirs("I", cl::desc("Directory of include files"),
               cl::value_desc("directory"), cl::Prefix);
@@ -161,6 +158,9 @@
 
 
 // FIXME: Eliminate globals from tblgen.
+cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
+
 RecordKeeper llvm::Records;
 
 static SourceMgr SrcMgr;