20b8d3f52b
We've been increasing the coverage of libc++ LLDB tests in the pre-merge CI (see https://github.com/llvm/llvm-project/pull/110570). Unfortunately the tests are spread across different targets. It would be great if we had a single target that libc++ maintainers could run. We do this by passing the `libc++` test-category as a parameter to LLDB's [`dotest` testing framework](https://lldb.llvm.org/resources/test.html). This will only run LLDB tests that have been marked as belonging to the `libc++` category.