[clang] Add necessary linker flags when -static-pie is enabled in BareMetal Toolchain (PR #147589)

[Garvit Gupta via cfe-commits]

quic-garvgupt wrote:

"Gentle ping @petrhosek @smithp35 - if the changes look good and all your comments have been addressed, can you approve the PR as well. Thanks!"

https://github.com/llvm/llvm-project/pull/147589