From df58dd84182a78ac48e1199ca95e9ecbab9db1ea Mon Sep 17 00:00:00 2001
From: Max Kazantsev <max.kazantsev@azul.com>
Date: Wed, 15 Aug 2018 05:50:38 +0000
Subject: [PATCH] [NFC] Add sanitizing assertion to ICF tracker

llvm-svn: 339751
---
 llvm/lib/Transforms/Utils/ImplicitControlFlowTracking.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/Utils/ImplicitControlFlowTracking.cpp b/llvm/lib/Transforms/Utils/ImplicitControlFlowTracking.cpp
index a5b6c54533ad..0e1591f42ad6 100644
--- a/llvm/lib/Transforms/Utils/ImplicitControlFlowTracking.cpp
+++ b/llvm/lib/Transforms/Utils/ImplicitControlFlowTracking.cpp
@@ -24,7 +24,9 @@ const Instruction *
 ImplicitControlFlowTracking::getFirstICFI(const BasicBlock *BB) {
   if (!KnownBlocks.count(BB))
     fill(BB);
-  return FirstImplicitControlFlowInsts.lookup(BB);
+  auto *FirstICF = FirstImplicitControlFlowInsts.lookup(BB);
+  assert((!FirstICF || FirstICF->getParent() == BB) && "Inconsistent cache!");
+  return FirstICF;
 }
 
 bool ImplicitControlFlowTracking::hasICF(const BasicBlock *BB) {