[llvm] [Clang] Prevent `mlink-builtin-bitcode` from internalizing the RPC client (PR #118661)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

Ping, this is a little hacky since the real solution is to stop using `-mlink-builtin-bitcode`, but I'd like to let this be optimized out on NVPTX before the release.

https://github.com/llvm/llvm-project/pull/118661