Remove _GLIBCXX14_USE_CONSTEXPR

	* include/bits/c++config (_GLIBCXX14_USE_CONSTEXPR): Remove it.
	* include/bits/hashtable_policy.h (_Power2_rehash_policy::_M_next_bkt):
	Remove const qualification on function. Replace
	_GLIBCXX14_USE_CONSTEXPR on automatic variables with const.
	(_Power2_rehash_policy::_M_need_rehash): Remove const qualification.
	(_Power2_rehash_policy::_M_next_bkt): Remove mutable specifier.

From-SVN: r236697

libstdc++-v3/ChangeLog

+2016-05-25  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/c++config (_GLIBCXX14_USE_CONSTEXPR): Remove it.
+	* include/bits/hashtable_policy.h (_Power2_rehash_policy::_M_next_bkt):
+	Remove const qualification on function. Replace
+	_GLIBCXX14_USE_CONSTEXPR on automatic variables with const.
+	(_Power2_rehash_policy::_M_need_rehash): Remove const qualification.
+	(_Power2_rehash_policy::_M_next_bkt): Remove mutable specifier.
+
 2016-05-24  François Dumont  <fdumont@gcc.gnu.org>
 
 	* include/bits/c++config (_GLIBCXX14_USE_CONSTEXPR): New.

libstdc++-v3/include/bits/c++config

@@ -106,10 +106,8 @@
 #ifndef _GLIBCXX14_CONSTEXPR
 # if __cplusplus >= 201402L
 #  define _GLIBCXX14_CONSTEXPR constexpr
-#  define _GLIBCXX14_USE_CONSTEXPR constexpr
 # else
 #  define _GLIBCXX14_CONSTEXPR
-#  define _GLIBCXX14_USE_CONSTEXPR const
 # endif
 #endif
 

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

@@ -557,13 +557,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     // Return a bucket size no smaller than n (as long as n is not above the
     // highest power of 2).
     std::size_t
-    _M_next_bkt(std::size_t __n) const noexcept
+    _M_next_bkt(std::size_t __n) noexcept
     {
-      _GLIBCXX14_USE_CONSTEXPR size_t __max_width
-	= std::min<size_t>(sizeof(size_t), 8);
-      _GLIBCXX14_USE_CONSTEXPR auto __max_bkt
-	= std::size_t(1) << (__max_width * __CHAR_BIT__ - 1);
-
+      const auto __max_width = std::min<size_t>(sizeof(size_t), 8);
+      const auto __max_bkt = size_t(1) << (__max_width * __CHAR_BIT__ - 1);
       std::size_t __res = __clp2(__n);
 
       if (__res == __n)
@@ -595,7 +592,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     // is the new bucket count.  If not, return make_pair(false, 0).
     std::pair<bool, std::size_t>
     _M_need_rehash(std::size_t __n_bkt, std::size_t __n_elt,
-		   std::size_t __n_ins) const noexcept
+		   std::size_t __n_ins) noexcept
     {
       if (__n_elt + __n_ins >= _M_next_resize)
 	{
@@ -630,8 +627,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     static const std::size_t _S_growth_factor = 2;
 
-    float		_M_max_load_factor;
-    mutable std::size_t	_M_next_resize;
+    float	_M_max_load_factor;
+    std::size_t	_M_next_resize;
   };
 
   // Base classes for std::_Hashtable.  We define these base classes