Roll libc++ from 4cba0fa3571b to 99d9ab2603b0 (9 revisions)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git/+log/4cba0fa3571b..99d9ab2603b0

2025-11-18 [email protected] [libc++][span] Mark functions as `[[nodiscard]]` (#168033)
2025-11-17 [email protected] [libc++] Replace a few .compile.fail.cpp tests by proper clang-verify tests (#167346)
2025-11-17 [email protected] [libc++] Enable compiler-rt when performing a bootstrapping build (#167065)
2025-11-17 [email protected] [libc++] Fix __hash_table::erase(iterator, iterator) to update the bucket list correctly when erasing the last bucket (#167865)
2025-11-17 [email protected] [libc++] Refactor basic_string::__recommend (#162631)
2025-11-16 [email protected] [libcxx] Install ninja in CI container from system repo (#168225)
2025-11-16 [email protected] [libc++][test] re-enable the inference test for clang (#168258)
2025-11-15 [email protected] [libc++] Make `std::numeric_limits<NonPromoted>::traps` `false` (#166724)
2025-11-15 [email protected] [libc++] Apply `[[nodiscard]]` to `in/out_ptr` (#167097)

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 [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

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Change-Id: I2ab858048b07a0da1127a6b5234f255e759c0c7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7166615
Reviewed-by: Hans Wennborg <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1548483}
NOKEYCHECK=True
GitOrigin-RevId: 1a595228f9a1f780ded1fe9d2281a27ccfa7de68

Author: chromium-autoroll

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 = "4cba0fa3571b78aca49da1e4e51bfd63a43729ee"
+  libcxx_revision = "99d9ab2603b02b6fb974cf19be99777f5cd99e7a"
 }

third_party/libc++/libcxx_headers.gni

@@ -11,7 +11,7 @@
 import("//buildtools/deps_revisions.gni")
 
 assert(
-    libcxx_revision == "4cba0fa3571b78aca49da1e4e51bfd63a43729ee",
+    libcxx_revision == "99d9ab2603b02b6fb974cf19be99777f5cd99e7a",
     "libcxx_headers.gni and third_party/libc++ are out of sync.$0x0A$0x0AIf you were messing around with the libc++ repository, run:$0x0A`buildtools/third_party/libc++/generate_libcxx_headers.py`$0x0A$0x0AIf the script doesn't resolve the error, file a bug to msta@ with reproduction details.$0x0A")
 
 libcxx_headers = [