[gn build] Port 1306b102

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

@@ -122,6 +122,8 @@ if (current_toolchain == default_toolchain) {
       "__algorithm/pop_heap.h",
       "__algorithm/prev_permutation.h",
       "__algorithm/push_heap.h",
+      "__algorithm/ranges_count.h",
+      "__algorithm/ranges_count_if.h",
       "__algorithm/ranges_find.h",
       "__algorithm/ranges_find_if.h",
       "__algorithm/ranges_find_if_not.h",