PR libstdc++/80448 remove noexcept from defaulted functions

	PR libstdc++/80448
	* include/experimental/bits/fs_dir.h (directory_iterator)
	(recursive_directory_iterator): Remove noexcept from defaulted
	constructors.

From-SVN: r246993

libstdc++-v3/ChangeLog

 2017-04-19  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/80448
+	* include/experimental/bits/fs_dir.h (directory_iterator)
+	(recursive_directory_iterator): Remove noexcept from defaulted
+	constructors.
+
 	PR libstdc++/80446
 	* include/std/type_traits (is_aggregate): Change __has_builtin checks.
 	* libsupc++/new (launder): Likewise.

libstdc++-v3/include/experimental/bits/fs_dir.h

@@ -181,7 +181,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     typedef const directory_entry& reference;
     typedef input_iterator_tag     iterator_category;
 
-    directory_iterator() noexcept = default;
+    directory_iterator() = default;
 
     explicit
     directory_iterator(const path& __p)
@@ -262,7 +262,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     typedef const directory_entry& reference;
     typedef input_iterator_tag     iterator_category;
 
-    recursive_directory_iterator() noexcept = default;
+    recursive_directory_iterator() = default;
 
     explicit
     recursive_directory_iterator(const path& __p)
@@ -282,8 +282,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     recursive_directory_iterator(
         const recursive_directory_iterator&) = default;
 
-    recursive_directory_iterator(
-        recursive_directory_iterator&&) noexcept = default;
+    recursive_directory_iterator(recursive_directory_iterator&&) = default;
 
     ~recursive_directory_iterator();