[libcxx-commits] [libcxx] [libc++] Avoid constructing additional objects when using map::at (PR #157866)

[Andrew Lazarev via libcxx-commits]

alazarev wrote:

Also broke 8 sanitizer buildbots:
https://lab.llvm.org/buildbot/#/builders/85/builds/13834
https://lab.llvm.org/buildbot/#/builders/94/builds/11176
https://lab.llvm.org/buildbot/#/builders/55/builds/17727
https://lab.llvm.org/buildbot/#/builders/24/builds/13003
https://lab.llvm.org/buildbot/#/builders/169/builds/15293
https://lab.llvm.org/buildbot/#/builders/25/builds/11761
https://lab.llvm.org/buildbot/#/builders/164/builds/13779
https://lab.llvm.org/buildbot/#/builders/52/builds/11391

https://github.com/llvm/llvm-project/pull/157866