From 807bc2a3814bb45b38702785ad9978153d176698 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Tue, 22 Mar 2011 03:21:01 +0000
Subject: [PATCH] Handle another case that Frits suggested.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128068 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/IPO/GlobalOpt.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index 7f69aeb0d02..0087362e339 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2746,11 +2746,13 @@ static bool cxxDtorIsEmpty(const Function &Fn,
       if (!CalledFn)
         return false;
 
+      SmallPtrSet<const Function *, 8> NewCalledFunctions(CalledFunctions);
+
       // Don't treat recursive functions as empty.
-      if (!CalledFunctions.insert(CalledFn))
+      if (!NewCalledFunctions.insert(CalledFn))
         return false;
 
-      if (!cxxDtorIsEmpty(*CalledFn, CalledFunctions))
+      if (!cxxDtorIsEmpty(*CalledFn, NewCalledFunctions))
         return false;
     } else if (isa<ReturnInst>(*I))
       return true;