LVI: Fix use-of-uninitialized-value after r294463

BlockValueStack can be reallocated making reference e invalid.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294572 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/LazyValueInfo.cpp b/lib/Analysis/LazyValueInfo.cpp
index e8f2d536c194efdb2d89be149c4da21b319909bb..877fc055358eb39c9355dd4cfbf2df61ca9b8c78 100644 (file)
--- a/lib/Analysis/LazyValueInfo.cpp
+++ b/lib/Analysis/LazyValueInfo.cpp
@@ -677,7 +677,7 @@ void LazyValueInfoImpl::solve() {
       BlockValueStack.clear();
       return;
     }
-    std::pair<BasicBlock *, Value *> &e = BlockValueStack.back();
+    std::pair<BasicBlock *, Value *> e = BlockValueStack.back();
     assert(BlockValueSet.count(e) && "Stack value should be in BlockValueSet!");
 
     if (solveBlockValue(e.second, e.first)) {