[llvm] Allow specifying libcxx builder image. (PR #110303)

[Walter Erquinigo via llvm-commits]

walter-erquinigo wrote:

> Any idea why we might fail to launch the test executable in a container (inside a container)?

You need to set up the debug session with `settings set target.disable-aslr false` so that you don't have that problem with the personality syscall. This can be done here https://github.com/llvm/llvm-project/blob/main/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py#L758 so that all launch requests use the correct setting.

https://github.com/llvm/llvm-project/pull/110303