Invalid macro names in tests

[François Dumont]

Hi

Working on adapting the same tests for _Rb_tree I noticed that the 
macros used in new alloc_ptr_ignored.cc tests are not the ones you 
eventually chose Jonathan.

I could have commit this trivial fix myself but the std::list test is 
then failing so I think it is better that I leave it to you. While you 
are at it I'll make sure it's not failing the same way for _Rb_tree.

François

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diff --git a/libstdc++-v3/testsuite/23_containers/forward_list/requirements/explicit_instantiation/alloc_ptr_ignored.cc b/libstdc++-v3/testsuite/23_containers/forward_list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
index 6205a2ff3bf..19df931a6a6 100644
--- a/libstdc++-v3/testsuite/23_containers/forward_list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
@@ -1,4 +1,4 @@
-// { dg-options "-D_GLIBCXX_FWDLIST_USE_ALLOC_PTR=0" }
+// { dg-options "-D_GLIBCXX_USE_ALLOC_PTR_FOR_FWD_LIST=0" }
 // { dg-do compile { target c++11 } }
 
 #include "alloc_ptr.cc"
diff --git a/libstdc++-v3/testsuite/23_containers/list/requirements/explicit_instantiation/alloc_ptr_ignored.cc b/libstdc++-v3/testsuite/23_containers/list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
index e6a499d2716..f5bbf2cb944 100644
--- a/libstdc++-v3/testsuite/23_containers/list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
+++ b/libstdc++-v3/testsuite/23_containers/list/requirements/explicit_instantiation/alloc_ptr_ignored.cc
@@ -1,4 +1,4 @@
-// { dg-options "-D_GLIBCXX_LIST_USE_ALLOC_PTR=0" }
+// { dg-options "-D_GLIBCXX_USE_ALLOC_PTR_FOR_LIST=0" }
 // { dg-do compile { target c++11 } }
 
 #include "alloc_ptr.cc"