Roll libc++ from 9aaa9a2ee87b to bcb59d372834 (9 revisions)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git/+log/9aaa9a2ee87b..bcb59d372834

2026-04-26 aidengrossman@google.com [libcxx] Remove package installation for generic-llvm-libc (#194259)
2026-04-26 aidengrossman@google.com [libcxx] Bump next runner set (#194211)
2026-04-26 aidengrossman@google.com [libcxx] Bump base image version to most recent (#194209)
2026-04-26 aidengrossman@google.com [libcxx] Include python3-yaml and rsync in container (#194182)
2026-04-25 de34@live.cn [libc++] P4144R1: Remove `span`'s `initializer_list` constructor for C++26 (#191428)
2026-04-25 hui.xie1990@gmail.com [libc++] Fix constant_wrapper::operator() (#193573)
2026-04-25 ldionne.2@gmail.com [libc++] Remove full header path from assertion messages (#190060)
2026-04-25 hawkinsw@obs.cr [libc++] Implement P1899 `ranges::stride_view` (#65200)
2026-04-24 aidengrossman@google.com [libcxx][Github] Add generic-llvm-libc config to CI (#193822)

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Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: I900a160d2b92110852597155c5bcd3369fcb1438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7796946
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GitOrigin-RevId: 1fd8ef7ff95f43192409e560c21441dd339abbf3