Harden Sema::MaybeBindTotemporary.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@117954 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExprCXX.cpp

@@ -2933,6 +2933,9 @@ QualType Sema::FindCompositePointerType(SourceLocation Loc,
 }
 
 ExprResult Sema::MaybeBindToTemporary(Expr *E) {
+  if (!E)
+    return ExprError();
+  
   if (!Context.getLangOptions().CPlusPlus)
     return Owned(E);