[clang] [llvm] [X86] Set .llvmbc and .llvmcmd to exclude sections (PR #151910)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

I think `-ffat-lto-objects` uses exclude metadata, but I'm not overly familiar with what that's intended to do.

https://github.com/llvm/llvm-project/pull/151910