From 26339b445ab3edc063a0985c7f536452e5f7363d Mon Sep 17 00:00:00 2001
From: Michael Zolotukhin <mzolotukhin@apple.com>
Date: Fri, 20 Apr 2018 07:59:57 +0000
Subject: [PATCH] [SSAUpdaterBulk] Add an assert.

llvm-svn: 330402
---
 llvm/lib/Transforms/Utils/SSAUpdaterBulk.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Transforms/Utils/SSAUpdaterBulk.cpp b/llvm/lib/Transforms/Utils/SSAUpdaterBulk.cpp
index 38dccb0..dbc671c 100644
--- a/llvm/lib/Transforms/Utils/SSAUpdaterBulk.cpp
+++ b/llvm/lib/Transforms/Utils/SSAUpdaterBulk.cpp
@@ -178,6 +178,7 @@ void SSAUpdaterBulk::RewriteAllUses(DominatorTree *DT,
         continue;
       Value *V = computeValueAt(getUserBB(U), R, DT);
       Value *OldVal = U->get();
+      assert(OldVal && "Invalid use!");
       // Notify that users of the existing value that it is being replaced.
       if (OldVal != V && OldVal->hasValueHandle())
         ValueHandleBase::ValueIsRAUWd(OldVal, V);
-- 
2.7.4