[clang] [Clang-REPL] Fix crash during `__run_exit_handlers` with dynamic libraries. (PR #117475)

[Davide Italiano via cfe-commits]

dcci wrote:

Given the fix forward didn't work, I reverted this to unblock

```
commit 61ab36a3e226df32855286dd31a2c3859800475d (HEAD -> main, upstream/main)
Author: Davide Italiano <davidino at meta.com>
Date:   Sat Dec 14 18:25:50 2024 +0000

    Revert "[Clang-REPL] Fix crash during `__run_exit_handlers` with dynamic libraries. (#117475)"
    
    This reverts commit 30ad53b92cec0cff9679d559edcc5b933312ba0c as it breaks
    systems that don't have a systemwide libc++ or libstdc++ installed. It should
    be rewritten to not invoke the system linker. In the meanwhile, reverting
    to unblock the bots.

commit 9ddcaed3a64c2a187a0cfff4ba8f989c665ae1e5
Author: Davide Italiano <davidino at meta.com>
Date:   Sat Dec 14 18:25:02 2024 +0000

    Revert "[Clang] Interpreter test should not depend on system header (#119903)"
    
    This reverts commit 8ab6912831277d87838518c5f775f79d14616860.
```

as it seems to need some amount of work. Feel free to ping us so we can try this patch once you have something ready to confirm it fixes the build.

https://github.com/llvm/llvm-project/pull/117475