[gn build] Port 9540950

Author: llvmgnsyncbot

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

@@ -143,7 +143,6 @@ if (current_toolchain == default_toolchain) {
       "__algorithm/pop_heap.h",
       "__algorithm/prev_permutation.h",
       "__algorithm/pstl.h",
-      "__algorithm/pstl_frontend_dispatch.h",
       "__algorithm/push_heap.h",
       "__algorithm/ranges_adjacent_find.h",
       "__algorithm/ranges_all_of.h",
@@ -646,11 +645,12 @@ if (current_toolchain == default_toolchain) {
       "__numeric/transform_reduce.h",
       "__ostream/basic_ostream.h",
       "__ostream/print.h",
+      "__pstl/backend.h",
+      "__pstl/backend_fwd.h",
+      "__pstl/backends/default.h",
       "__pstl/backends/libdispatch.h",
       "__pstl/backends/serial.h",
       "__pstl/backends/std_thread.h",
-      "__pstl/configuration.h",
-      "__pstl/configuration_fwd.h",
       "__pstl/cpu_algos/any_of.h",
       "__pstl/cpu_algos/cpu_traits.h",
       "__pstl/cpu_algos/fill.h",
@@ -660,6 +660,8 @@ if (current_toolchain == default_toolchain) {
       "__pstl/cpu_algos/stable_sort.h",
       "__pstl/cpu_algos/transform.h",
       "__pstl/cpu_algos/transform_reduce.h",
+      "__pstl/dispatch.h",
+      "__pstl/handle_exception.h",
       "__random/bernoulli_distribution.h",
       "__random/binomial_distribution.h",
       "__random/cauchy_distribution.h",