Add a trivial functor for use with unique_ptrs managing memory that needs to be freed rather than deleted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216790 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/STLExtras.h

@@ -530,6 +530,12 @@ make_unique(size_t n) {
 
 #endif
 
+struct FreeDeleter {
+  void operator()(void* v) {
+    ::free(v);
+  }
+};
+
 template<typename First, typename Second>
 struct pair_hash {
   size_t operator()(const std::pair<First, Second> &P) const {