Revert my user-defined literal commits - r1124{58,60,67} pending
some issues being sorted out.

llvm-svn: 112493
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index d067668..14cbbaf 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -2423,8 +2423,7 @@
   case Expr::UnaryTypeTraitExprClass:
     return NoDiag();
   case Expr::CallExprClass:
-  case Expr::CXXOperatorCallExprClass:
-  case Expr::UDLiteralExprClass: {
+  case Expr::CXXOperatorCallExprClass: {
     const CallExpr *CE = cast<CallExpr>(E);
     if (CE->isBuiltinCall(Ctx))
       return CheckEvalInICE(E, Ctx);