[clang] [clang-repl] Implement LoadDynamicLibrary for clang-repl wasm use cases (PR #133037)

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

> > We really need to figure out how to add in-tree tests.
> 
> Yupp sadly I was only able to test this through cppinterop and xeus-cpp as I've commented above ([#133037 (comment)](https://github.com/llvm/llvm-project/pull/133037#discussion_r2015819533)) where it works as expected :\
> 
> I shall take out some time in the near future to ideate on this.

I am wondering if we can add such CI for llvm, too... maybe you can discuss that at the llvm discord's infrastructure channel...

https://github.com/llvm/llvm-project/pull/133037