google/xls

AI Summary: The task is to fix the `rebuild_documentation` target in the XLS (Accelerated HW Synthesis) project so that it correctly regenerates the `passes_list.md` file in the open-source version. The current issue stems from differences in how the libcxx library is handled between the internal Google build and the external open-source build, causing the `libtooling` binary used by the target to fail to find the necessary library. A potential solution involves building libcxx separately within Bazel and configuring the `rebuild_documentation` target to use it, but this requires significant effort due to the lack of an existing OSS Bazel build for libcxx.