Roll src/third_party/libc++/src/ b4e85a368..4f05e20cb (6 commits)

b4e85a3686..4f05e20cbe

$ git log b4e85a368..4f05e20cb --date=short --no-merges --format='%ad %ae %s'
2025-03-07 de34 [libc++] Implement part of P2562R1: constexpr `ranges::stable_sort` (#128860)
2025-03-06 nikolasklauser [libc++] Remove identity casts in <{forward_,}list> (#130049)
2025-03-06 nikolasklauser [libc++] Remove a few unused includes from <__concepts/*> (#129883)
2025-03-06 de34 [libc++] Verify that LWG4140 is implemented (#128624)
2025-03-06 de34 [libc++] Implement part of P2562R1: constexpr `ranges::stable_partition` (#129839)
2025-03-06 atetubou [libcxx] Export directory_iterator in module build (#129195)

Created with:
  roll-dep src/third_party/libc++/src

Bug: none
Change-Id: Id48fed67510f254636c68d2862afd2765c09410f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6348617
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1431671}

DEPS

@@ -519,7 +519,7 @@ vars = {
 
   # If you change this, also update the libc++ revision in
   # //buildtools/deps_revisions.gni.
-  'libcxx_revision':       'b4e85a36868ce10947a1946fea0cb51c7c3e6167',
+  'libcxx_revision':       '4f05e20cbe1d02fa0871ac88b30eead9e38cab3a',
 
   # GN CIPD package version.
   'gn_version': 'git_revision:18602f6cf1168cf78302024043edc02e8bad2ffb',

buildtools/deps_revisions.gni

@@ -5,5 +5,5 @@
 declare_args() {
   # Used to cause full rebuilds on libc++ rolls. This should be kept in sync
   # with the libcxx_revision var in //DEPS.
-  libcxx_revision = "b4e85a36868ce10947a1946fea0cb51c7c3e6167"
+  libcxx_revision = "4f05e20cbe1d02fa0871ac88b30eead9e38cab3a"
 }