Roll libc++ from 0fbc2a9792a1 to 34685c3c0e34 (1 revision)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git/+log/0fbc2a9792a1..34685c3c0e34

2024-01-07 koraq@xs4all.nl [libc++][test] Improves suspurious clang diagnostics. (#77234)

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.

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To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

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Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: If3e4c5fc3581ff92a88a4bd81a44c746f584c79c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5174842
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1243847}

DEPS

@@ -494,7 +494,7 @@ vars = {
 
   # If you change this, also update the libc++ revision in
   # //buildtools/deps_revisions.gni.
-  'libcxx_revision':       '0fbc2a9792a1bffb7e1333f25743aa36782678f3',
+  'libcxx_revision':       '34685c3c0e3410d1e45d8aaee3c7ce22e50e9216',
 
   # GN CIPD package version.
   'gn_version': 'git_revision:85944ebc24a90ec1e489e85a46fdc68542c3146f',

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 vars in //DEPS.
-  libcxx_revision = "0fbc2a9792a1bffb7e1333f25743aa36782678f3"
+  libcxx_revision = "34685c3c0e3410d1e45d8aaee3c7ce22e50e9216"
 }