Re-add previously removed XFAILs to facet tests

Author: ldionne

libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp

@@ -6,6 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// The fix for LWG2381 (https://github.com/llvm/llvm-project/pull/77948) changed behavior of
+// FP parsing. This requires 3e15c97fa3812993bdc319827a5c6d867b765ae8 in the dylib.
+// XFAIL: using-built-library-before-llvm-19
+
 // <locale>
 
 // class num_get<charT, InputIterator>

libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp

@@ -6,6 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// The fix for LWG2381 (https://github.com/llvm/llvm-project/pull/77948) changed behavior of
+// FP parsing. This requires 3e15c97fa3812993bdc319827a5c6d867b765ae8 in the dylib.
+// XFAIL: using-built-library-before-llvm-19
+
 // <locale>
 
 // class num_get<charT, InputIterator>

libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp

@@ -6,6 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// The fix for LWG2381 (https://github.com/llvm/llvm-project/pull/77948) changed behavior of
+// FP parsing. This requires 3e15c97fa3812993bdc319827a5c6d867b765ae8 in the dylib.
+// XFAIL: using-built-library-before-llvm-19
+
 // <locale>
 
 // class num_get<charT, InputIterator>