[clang] [Clang-Repl] Adds custom lambda in launchExecutor and PID retrieval (PR #152562)

[Bart Chrzaszcz via cfe-commits]

bartchr808 wrote:

It's likely adding the 2nd bin due to 
```
llvm::sys::path::append(ExecutorPath, "bin", "llvm-jitlink-executor");
```
I suspect?

https://github.com/llvm/llvm-project/pull/152562