Missed ChangeLog for previous libstdc++-v3 commit

Missed ChangeLog for previous libstdc++-v3 commit

Add include/experimental/bits dir

	* include/experimental/erase_if.h: Move to ...
	* include/experimental/bits/erase_if.h: New.
	* include/experimental/fs_dir.h: Move to ...
	* include/experimental/bits/fs_dir.h: New.
	* include/experimental/fs_fwd.h: Move to ...
	* include/experimental/bits/fs_fwd.h: New.
	* include/experimental/fs_ops.h: Move to ...
	* include/experimental/bits/fs_ops.h: New.
	* include/experimental/fs_path.h: Move to ...
	* include/experimental/bits/fs_path.h: New.
	* include/experimental/string_view.tcc: Move to ...
	* include/experimental/bits/string_view.tcc: New.
	* include/Makefile.am: Add include/experimental/bits sub-directory.
	* include/Makefile.in: Regenerate.
	* include/experimental/filesystem: Adjust includes.
	* include/experimental/map: Likewise.
	* include/experimental/set: Likewise.
	* include/experimental/string_view: Likewise.
	* include/experimental/unordered_map: Likewise.
	* include/experimental/unordered_set: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228646 138bc75d-0d04-0410-961f-82ee72b054a4