[libcxx-commits] [libcxx] [libc++] Fix `regex_search` to match `$` alone with `match_default` flag (PR #78845)

[Sanjay Marreddi via libcxx-commits]

SanjayMarreddi wrote:

- I can see that `std/re/re.const/re.matchflag/match_not_eol.pass.cpp` is failing in `generic-cxx03`. 
- However locally, when I ran the tests using `sudo libcxx/utils/libcxx-lit build/ -sv libcxx/test/std/re/re.const`, the test passed. 
- How do I replicate the above behaviour locally to fix the failing tests on CI?

https://github.com/llvm/llvm-project/pull/78845