[gn build] Port 3c56437

Author: llvmgnsyncbot

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

@@ -1457,6 +1457,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/extent.h",
       "__type_traits/has_unique_object_representation.h",
       "__type_traits/has_virtual_destructor.h",
+      "__type_traits/integer_traits.h",
       "__type_traits/integral_constant.h",
       "__type_traits/invoke.h",
       "__type_traits/is_abstract.h",
@@ -1507,7 +1508,6 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_same.h",
       "__type_traits/is_scalar.h",
       "__type_traits/is_signed.h",
-      "__type_traits/is_signed_integer.h",
       "__type_traits/is_specialization.h",
       "__type_traits/is_standard_layout.h",
       "__type_traits/is_swappable.h",
@@ -1521,7 +1521,6 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_unbounded_array.h",
       "__type_traits/is_union.h",
       "__type_traits/is_unsigned.h",
-      "__type_traits/is_unsigned_integer.h",
       "__type_traits/is_valid_expansion.h",
       "__type_traits/is_void.h",
       "__type_traits/is_volatile.h",