fix leakage of ValueNumbering

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58933 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/PredicateSimplifier.cpp b/lib/Transforms/Scalar/PredicateSimplifier.cpp
index 5baaec1..f5c68ab 100644
--- a/lib/Transforms/Scalar/PredicateSimplifier.cpp
+++ b/lib/Transforms/Scalar/PredicateSimplifier.cpp
@@ -2465,6 +2465,7 @@
     delete DTDFS;
     delete VR;
     delete IG;
+    delete VN;
 
     modified |= UB.kill();