Revert "Revert "Merge to upstream r304942.""

This reverts commit 38a0d5af7e.

Test: make checkbuild
Test: ./run_tests.py
Test: ./run_tests.py --bitness 64

test/std/numerics/numarray/template.valarray/valarray.cons/initializer_list.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 // <valarray>
 
 // template<class T> class valarray;
@@ -18,7 +20,6 @@
 
 int main()
 {
-#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
     {
         typedef int T;
         T a[] = {1, 2, 3, 4, 5};
@@ -37,5 +38,4 @@ int main()
         for (unsigned i = 0; i < N; ++i)
             assert(v[i] == a[i]);
     }
-#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 }