[clang] [clang-repl] Set up native platform support if ORC Runtime available (PR #217988)

[via cfe-commits]

khanxmetu wrote:

Further to this, I think its worth removing [`if (!IsOutOfProcess)` guard in `UpdateOrcRuntimePath`](https://github.com/llvm/llvm-project/blob/25e82c1be918584f0fb796b257ccbb037007d1e5/clang/lib/Interpreter/IncrementalExecutor.cpp#L469-L470) to allow for runtime path discovery - when its not specified - regardless of oop flag.

https://github.com/llvm/llvm-project/pull/217988