[Lldb-commits] [lldb] Refactor TypeSystemClang to use static language set initialization (PR #172567)

[Greg Clayton via lldb-commits]

https://github.com/clayborg approved this pull request.

Jonas, I worked with Bar on this fix. We would see an warning message like this:
```
warning: This version of LLDB has no plugin for the language "rust". Inspection of frame variables will be limited.
```
Even though the language was indeed supported by `TypeSystemClang`. This gets us down to one source of truth for which languages are supported. 

https://github.com/llvm/llvm-project/pull/172567