Roll libc++ from 3fc0bf23fe4f to 81925935fdd2 (1 revision)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git/+log/3fc0bf23fe4f..81925935fdd2

2022-11-15 ldionne.2@gmail.com [libc++] Make it an error to define _LIBCPP_DEBUG

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
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is aware of the problem.

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Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: I43fdc82be247e8144be7273950c4c198a6895712
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4027500
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@{#1071654}
NOKEYCHECK=True
GitOrigin-RevId: ab3a413421e318ea1ea326260a642a91c6163b52

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 = "3fc0bf23fe4fcfb3e952ba9f857ef15eb2603429"
+  libcxx_revision = "81925935fdd2102dbe94aa6aadfa5203a6f11dba"
 }