From d215fd3b74b90f5dc1964610926fcc2a20f959aa Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 6 Jan 2018 21:34:26 +0000
Subject: Vendor import of llvm release_60 branch r321788:
 https://llvm.org/svn/llvm-project/llvm/branches/release_60@321788

---
 lib/IR/BasicBlock.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/IR/BasicBlock.cpp')

diff --git a/lib/IR/BasicBlock.cpp b/lib/IR/BasicBlock.cpp
index 22513924a96d..938c40182b92 100644
--- a/lib/IR/BasicBlock.cpp
+++ b/lib/IR/BasicBlock.cpp
@@ -264,7 +264,8 @@ const BasicBlock *BasicBlock::getUniqueSuccessor() const {
 }
 
 iterator_range<BasicBlock::phi_iterator> BasicBlock::phis() {
-  return make_range<phi_iterator>(dyn_cast<PHINode>(&front()), nullptr);
+  PHINode *P = empty() ? nullptr : dyn_cast<PHINode>(&*begin());
+  return make_range<phi_iterator>(P, nullptr);
 }
 
 /// This method is used to notify a BasicBlock that the
-- 
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