Revert "Roll libc++ from a01c02c9d4ac to a9cc573e7c59 (8 revisions)"

This reverts commit dba214ab95.

Reason for revert: Failure of PartitionAllocPageAllocatorTest.DecommitAndZero and telemetry.page.cache_temperature_unittest.CacheTemperatureTests.testEnsureHotAfterColdRun.

Original change's description:
> Roll libc++ from a01c02c9d4ac to a9cc573e7c59 (8 revisions)
>
> a01c02c9d4..a9cc573e7c
>
> 2025-05-06 winner245@hotmail.com [libc++][NFC] Improve test readability for std::fill_n (#133771)
> 2025-05-06 nikolasklauser@berlin.de [libc++][NFC] Remove a bunch of redundant ASan existence checks (#128504)
> 2025-05-06 de34@live.cn [libc++][test] Test `flat_meow` with proper underlying iterators (#131290)
> 2025-05-06 raul@tambre.ee [libcxx][CMake] Use the right variable in the C library error message (#138458)
> 2025-05-06 ldionne.2@gmail.com [libc++] Remove redundant and somewhat confusing assertions around advance() (#133276)
> 2025-05-06 ldionne.2@gmail.com [libc++] Improve the test coverage for std::vector::emplace (#132440)
> 2025-05-06 ldionne.2@gmail.com [libc++] Enable sized deallocation when building operator new shims on Apple (#134152)
> 2025-05-06 nikolasklauser@berlin.de [libc++][C++03] Remove code that is not used in C++03 (#134045)
>
> If this roll has caused a breakage, revert this CL and stop the roller
> using the controls here:
> https://autoroll.skia.org/r/libcxx-chromium
> Please CC hans@chromium.org,thakis@chromium.org on the revert to ensure that a human
> is aware of the problem.
>
> To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry
>
> To report a problem with the AutoRoller itself, please file a bug:
> https://issues.skia.org/issues/new?component=1389291&template=1850622
>
> Documentation for the AutoRoller is here:
> https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
>
> Tbr: hans@chromium.org,thakis@chromium.org
> Change-Id: I3b7e2453635e302222c01c358d67a59eeb56fd4a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6517219
> Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
> Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#1456697}

Bug: 414813537, 416151077
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ieeadf900b3d5a29509116ae78f8841d334c91598
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6519632
Auto-Submit: Antonio Sartori <antoniosartori@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1456943}

DEPS

@@ -527,7 +527,7 @@ vars = {
 
   # If you change this, also update the libc++ revision in
   # //buildtools/deps_revisions.gni.
-  'libcxx_revision':       'a9cc573e7c591795d11b72d8323ba0e573b55bd6',
+  'libcxx_revision':       'a01c02c9d4acbdae3b7e8a2f3ee58579a9c29f96',
 
   # GN CIPD package version.
   'gn_version': 'git_revision:487f8353f15456474437df32bb186187b0940b45',

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 = "a9cc573e7c591795d11b72d8323ba0e573b55bd6"
+  libcxx_revision = "a01c02c9d4acbdae3b7e8a2f3ee58579a9c29f96"
 }