Merge "constexpr constructor for atfork_list_t"
am: 9d8632e1a7

* commit '9d8632e1a76de6bd6abc853c0fbd6a2c9dc32cdc':
  constexpr constructor for atfork_list_t
diff --git a/libc/bionic/pthread_atfork.cpp b/libc/bionic/pthread_atfork.cpp
index 093ffd2..2200a6c 100644
--- a/libc/bionic/pthread_atfork.cpp
+++ b/libc/bionic/pthread_atfork.cpp
@@ -45,7 +45,7 @@
 
 class atfork_list_t {
  public:
-  atfork_list_t() : first_(nullptr), last_(nullptr) {}
+  constexpr atfork_list_t() : first_(nullptr), last_(nullptr) {}
 
   template<typename F>
   void walk_forward(F f) {