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

[Haohai Wen via llvm-commits]

HaohaiWen wrote:

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

Effect of exclude kind: https://discourse.llvm.org/t/end-to-end-fembed-bitcode-llvmbc-and-llvmcmd/56265/14?u=haohaiwen

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