Assert that a call argument is a gl-value iff the parameter is a reference type.

llvm-svn: 138639

clang/lib/CodeGen/CGCall.cpp

@@ -1431,6 +1431,9 @@ void CodeGenFunction::EmitCallArg(CallArgList &args, const Expr *E,
     return emitWritebackArg(*this, args, CRE);
   }
 
+  assert(type->isReferenceType() == E->isGLValue() &&
+         "reference binding to unmaterialized r-value!");
+
   if (type->isReferenceType())
     return args.add(EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0),
                     type);