Push twines deeper into SourceMgr's error handling methods.

llvm-svn: 114847
diff --git a/llvm/utils/TableGen/TableGen.cpp b/llvm/utils/TableGen/TableGen.cpp
index 5e3e282..d47897d 100644
--- a/llvm/utils/TableGen/TableGen.cpp
+++ b/llvm/utils/TableGen/TableGen.cpp
@@ -174,7 +174,7 @@
 
 static SourceMgr SrcMgr;
 
-void llvm::PrintError(SMLoc ErrorLoc, const std::string &Msg) {
+void llvm::PrintError(SMLoc ErrorLoc, const Twine &Msg) {
   SrcMgr.PrintMessage(ErrorLoc, Msg, "error");
 }