[LLDB] Fix 582582fb

This issue has been seen in

- https://lab.llvm.org/buildbot/#/builders/17/builds/39525
- https://lab.llvm.org/buildbot/#/builders/68/builds/55140

The reason is that a new language tag has been added for Mojo, but other recent languages need to be added to the language array so that a name lookup array doesn't have gaps.

`ninja check-lldb-shell-process` now passes.