[llvm-branch-commits] [libcxx] [libc++] Make benchmarks dry-run by default on the release branch (PR #126441)

[Rainer Orth via llvm-branch-commits]

rorth wrote:

I've just seen the same issue in a 21.1.0 rc build on Ubuntu 22.04 (229 failures in `llvm-libc++-shared.cfg.in :: benchmarks`).  It seems the LLVM 21 release needs the same fix/workaround.

https://github.com/llvm/llvm-project/pull/126441