OpChain has subclasses, so add a virtual destructor.

Summary:
OpChain has subclasses, so add a virtual destructor.

This fixes an issue when deleting subclasses of OpChain (see MatchSMLAD() specifically) in r337701.

Reviewers: javed.absar

Subscribers: llvm-commits, SjoerdMeijer, samparker

Differential Revision: https://reviews.llvm.org/D49681

llvm-svn: 337713

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMParallelDSP.cpp b/llvm/lib/Target/ARM/ARMParallelDSP.cpp
index 24eb0bb2f87..f3d8da63d56 100644
--- a/llvm/lib/Target/ARM/ARMParallelDSP.cpp
+++ b/llvm/lib/Target/ARM/ARMParallelDSP.cpp
@@ -64,6 +64,7 @@ namespace {
     bool          ReadOnly = true;
 
     OpChain(Instruction *I, ValueList &vl) : Root(I), AllValues(vl) { }
+    virtual ~OpChain() = default;
 
     void SetMemoryLocations() {
       const auto Size = MemoryLocation::UnknownSize;