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

[Anutosh Bhat via cfe-commits]

anutosh491 wrote:

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

Absolutely, I shall do that and get back to you on this (I think there are people at llvm looking into llvm+emscripten use cases and should support something like this)

Shall keep you updated. 

In the meantime would be great to have your views on the above ... and possibly if you could give me the green flag here :)
I think the [reasoning](https://github.com/llvm/llvm-project/pull/133037#discussion_r2015816316) sits well in a wasm context and would expand the interpreter's functionality to put any 3rd party/custom shared lib to use (issue description shows the interpreter loading **symengine** at runtime) . We also have a decent framework now through downstream projects to test something like the above.

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