Add __attribute__((malloc) to allocator and remove unused code

	* include/bits/valarray_array.h (__valarray_get_memory): Remove.
	(__valarray_get_storage): Call operator new directly. Remove ignored
	top-level restrict qualifier and add malloc attribute instead.
	(_Array<_Tp>::_Array(size_t)): Remove unused constructor.

From-SVN: r260230

libstdc++-v3/ChangeLog

 2018-05-14  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/valarray_array.h (__valarray_get_memory): Remove.
+	(__valarray_get_storage): Call operator new directly. Remove ignored
+	top-level restrict qualifier and add malloc attribute instead.
+	(_Array<_Tp>::_Array(size_t)): Remove unused constructor.
+
 	PR libstdc++/67554
 	* include/bits/valarray_array.h (_Array_copy_ctor<_Tp, true>)
 	(_Array_copier<_Tp, true>): Do not pass null pointers to memcpy.

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

@@ -47,18 +47,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Helper functions on raw pointers
   //
 
-  // We get memory by the old fashion way
-  inline void*
-  __valarray_get_memory(size_t __n)
-  { return operator new(__n); }
+  // We get memory the old fashioned way
+  template<typename _Tp>
+    _Tp*
+    __valarray_get_storage(size_t) __attribute__((__malloc__));
 
   template<typename _Tp>
-    inline _Tp*__restrict__
+    inline _Tp*
     __valarray_get_storage(size_t __n)
-    {
-      return static_cast<_Tp*__restrict__>
-	(std::__valarray_get_memory(__n * sizeof(_Tp)));
-    }
+    { return static_cast<_Tp*>(operator new(__n * sizeof(_Tp))); }
 
   // Return memory to the system
   inline void
@@ -410,7 +407,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct _Array
     {
-      explicit _Array(size_t);
       explicit _Array(_Tp* const __restrict__);
       explicit _Array(const valarray<_Tp>&);
       _Array(const _Tp* __restrict__, size_t);
@@ -505,12 +501,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     inline
-    _Array<_Tp>::_Array(size_t __n)
-    : _M_data(__valarray_get_storage<_Tp>(__n))
-    { std::__valarray_default_construct(_M_data, _M_data + __n); }
-
-  template<typename _Tp>
-    inline
     _Array<_Tp>::_Array(_Tp* const __restrict__ __p)
     : _M_data (__p) {}