Add missing change log for r171531

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@171893 138bc75d-0d04-0410-961f-82ee72b054a4

libstdc++-v3/ChangeLog

@@ -48,6 +48,15 @@
 	* config/os/solaris/solaris2.7/ctype_noninline.h: Likewise.
 	* config/os/solaris/solaris2.7/ctype_configure_char.cc: Likewise.
 
+2011-03-25  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	* include/std/future (future::share): Add.
+	(packaged_task::result_type): Remove as per LWG 2030.
+	(packaged_task::packaged_task): Remove redundant constructors, as per
+	LWG 1514.
+	* testsuite/30_threads/future/members/share.cc: New.
+	* testsuite/30_threads/packaged_task/requirements/typedefs.cc: Remove.
+
 2011-03-25  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	* testsuite/28_regex/match_results/ctors/char/default.cc: Do not call