More noexcept for standard mutex types and locks

	* include/bits/std_mutex.h (mutex::native_handle)
	(lock_guard(mutex_type&, adopt_lock_t)
	(unique_lock(mutex_type&, adopt_lock_t): Add noexcept.
	* include/std/mutex (recursive_mutex, timed_mutex)
	(recursive_timed_mutex): Likewise.

From-SVN: r240980

libstdc++-v3/ChangeLog

+2016-10-11  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/std_mutex.h (mutex::native_handle)
+	(lock_guard(mutex_type&, adopt_lock_t)
+	(unique_lock(mutex_type&, adopt_lock_t): Add noexcept.
+	* include/std/mutex (recursive_mutex, timed_mutex)
+	(recursive_timed_mutex): Likewise.
+
 2016-10-10  Jonathan Wakely  <jwakely@redhat.com>
 
 	* doc/xml/manual/appendix_contributing.xml (contrib.organization):

libstdc++-v3/include/bits/std_mutex.h

@@ -122,7 +122,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
     native_handle_type
-    native_handle()
+    native_handle() noexcept
     { return &_M_mutex; }
   };
 
@@ -161,7 +161,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       explicit lock_guard(mutex_type& __m) : _M_device(__m)
       { _M_device.lock(); }
 
-      lock_guard(mutex_type& __m, adopt_lock_t) : _M_device(__m)
+      lock_guard(mutex_type& __m, adopt_lock_t) noexcept : _M_device(__m)
       { } // calling thread owns mutex
 
       ~lock_guard()
@@ -206,7 +206,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       : _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock())
       { }
 
-      unique_lock(mutex_type& __m, adopt_lock_t)
+      unique_lock(mutex_type& __m, adopt_lock_t) noexcept
       : _M_device(std::__addressof(__m)), _M_owns(true)
       {
 	// XXX calling thread owns mutex

libstdc++-v3/include/std/mutex

@@ -124,7 +124,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
     native_handle_type
-    native_handle()
+    native_handle() noexcept
     { return &_M_mutex; }
   };
 
@@ -219,7 +219,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
     native_handle_type
-    native_handle()
+    native_handle() noexcept
     { return &_M_mutex; }
 
     private:
@@ -279,7 +279,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
     native_handle_type
-    native_handle()
+    native_handle() noexcept
     { return &_M_mutex; }
 
     private: