FoldingSet: Make FoldingSetImpl's dtor protected and non-virtual

It's not intended to be polymorphically deleted. Make FoldingSet
and ContextualFoldingSet final to avoid noise from -Wnon-virtual-dtor.

No functional change intended.

llvm-svn: 232922

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Support/FoldingSet.cpp b/llvm/lib/Support/FoldingSet.cpp
index 0bee31510f7..80d2aefe870 100644
--- a/llvm/lib/Support/FoldingSet.cpp
+++ b/llvm/lib/Support/FoldingSet.cpp
@@ -223,6 +223,8 @@ static void **AllocateBuckets(unsigned NumBuckets) {
 //===----------------------------------------------------------------------===//
 // FoldingSetImpl Implementation
 
+void FoldingSetImpl::anchor() {}
+
 FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) {
   assert(5 < Log2InitSize && Log2InitSize < 32 &&
          "Initial hash table size out of range");